Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dc79a39686787b…

MALICIOUS

PDF

111.6 KB Created: 2021-09-17 23:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59e968b403b76f20ec428f37c2722f79 SHA-1: 8659f29919c8a72919e56db9fb16a10f6afe84ca SHA-256: 57dc79a39686787b7662bb66a8340b061dab2725941d091a0b9f804beeed5cf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as containing a link farm and was classified as malicious by an ML model and ClamAV. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the ML classification indicate a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • 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.
  • 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=os+aplicativos+android PDF link annotation
    • https://alstar.uz/images/shared/file/83882366191.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/79255599202.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/20657996401.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/bibejozutilixa.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/me4n9lqpm5od1b8frqc26acud1/rurafuvesawabovaf.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/kazawonumopevigipibivira.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210912065401.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7vot4l9ke28a4s1br1srkun6g2/63981835862.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47914815007.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/18921780873.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/pedunefomiwonogimipikov.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/22407449053.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161406905e14bd---5381475535.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/61463510846.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xizufekijitupur.pdfIn PDF document text
    • http://riph.pl/userfiles/file/30625582987.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/6458755082.pdfIn PDF document text
    • http://theipbuzz.com/images/file/15296257474.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/penutejonawabuzikepode.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/xifosorawuj.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/tafevovufone.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/80056120181.pdfIn PDF document text
    • https://partnermind.cz/images/files/veborivonakusavagi.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/11422244529.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/tufivubovenelojubikog.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_off00014fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD1 18852 bytes
SHA-256: 663b72aeef4baea0141ac82db60eced6f83a9c7e843a4c86da884cd4b9331024
font_01_sfnt_off00018127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18127 10464 bytes
SHA-256: 75aab9af30d6a944f20e71d0ff046e9c4ca874436d4b3b5bc43a50b56a0ff719
font_02_sfnt_off0001990f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1990F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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