Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fa308ab550da35…

MALICIOUS

PDF

72.0 KB Created: 2021-10-03 05:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a94378546f59489a4d633f7ff76a4a96 SHA-1: 0755e1abb27bfa522e4ee8479f1a7f4d5a2f05b9 SHA-256: e7fa308ab550da35abc000d7dbd4e949bd6c74b0e0d639337fccbd7c9fcc3dcf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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) documents that carry no urgency or charge/dispute escalation.
  • 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 https://queure.ru/uplcv?utm_term=another+name+for+munchausen+syndrome PDF link annotation
    • http://eichler-kammerer.de/5358714197.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/lugozujijumek.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/zifuvejadabiwu.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/weteme.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/fuluvapisobesudijunoni.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/07a6c8984a60bbcc0ce39bab9c77caf3/32832968705.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce17d2169---kawik.pdfIn PDF document text
    • https://banghenails.com/upload/file/lobefavizabujuf.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/zajolasade.pdfIn PDF document text
    • http://builderall.info/userfiles/file/84647719862.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/63176772998.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/16987904305.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7a39e4fb76ff38939a2d19dabb47bdd6/46840024956.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9b789d0a1---36075196703.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/dipike.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210914191447.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/lawiparog.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/5550278954.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/16773026247.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/rixidaki.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/78657383561.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/xibaliruzakufajojuvoma.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/kuxuwevofotorak.pdfIn PDF document text
    • http://matras-devison.com/upload/file/fowipefojigusodutag.pdfIn PDF document text
    • 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_off0000b52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 17164 bytes
SHA-256: 36ba0798a8f0f2402d3b0f70add32b92dd1e937f496b77b96831a6dd9e9d034d
font_02_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 10796 bytes
SHA-256: 7a16cd78212357139b5de3e6c0737202791d49bdb5c313a5d49c8fc4cc83b41a

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