Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ea5e2af3767fc0…

MALICIOUS

PDF

120.0 KB Created: 2021-07-13 02:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 91d37753d4d8b40f24f2181123b48b84 SHA-1: 6032c92560516f1209ac1c028d7006a4c479cfbf SHA-256: 87ea5e2af3767fc06096f9610fdce1d2fa28cd2b189a400a831156f3c9a79a2b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a lure to download further malicious content. The presence of a 'download button' lure and a callback lure further supports a phishing or scam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wonsakai.com/uploads/files/vosevizazepolojivoxotup.pdf In PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d9fdf5bb---56546066291.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/53f88c4487f931402db729bfb7c651e2/67115905617.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/69727448965.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607464060526f---mewojimekezutumatep.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/famubakuwutet.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/dumojinatanadatij.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/a37af1944826b78d3e5f91a192e53bc6/rovok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e71a629a40---jadariwijufu.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/50212140337.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hj73il1gamu301mn8mt5oudpbd/zawamutapubuxodepek.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/xurenumodasekunajatog.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7b7705109bdc980825a80e95554f21ff/sopotiparimafizawinajumet.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c664923e8c2---95580952756.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d3a8228734cd24e8aba5d950af637d05/fopetunox.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16079833337aa1---11502481203.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c314b2dbe7c---fubujikaletojulujeka.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/ce64b382e9837a1859e685d98654c2f4/bevezotukulumivixiwilik.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/woziperiguluno.pdfIn PDF document text
    • http://chikatere.com/Upload/files/65137424255.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/92419051320.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c0b74204a94d4542bb350c996a1de720/71700901881.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38ee91cc6---tegizinibavika.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/961e33cfedfee19aa8337f90b65b514c/19470454389.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/lepoxuwipixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=all+weapons+gta+5+ps4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A34 17856 bytes
SHA-256: 2f35adaa5d1bf6d9f4bbe55dad797c2eacbe5c758cfeaf2383675a99bd4a2137
font_02_sfnt_off0001b921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B921 10512 bytes
SHA-256: 16b6468572dab684690ba4c62b6d6b2ea51eea8cec7447bbdcda5c144fc9ac03

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