Malicious PDF — malware analysis report

Static analysis result for SHA-256 838272f34a36ebd4…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 10:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 570221903db5e78bf2009e91c8d7eec0 SHA-1: 84b7af0700d3e52c6d33f6aae008869152b27060 SHA-256: 838272f34a36ebd4f0b9c9215301bf4e5a2ce881e0f87738a90e93d404bcb606
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=plastic+ends+on+shoelaces PDF link annotation
    • https://weekendtripskolkata.com/userfiles/file/wefovu.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/pepotizizaf.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/ed32a98a2eebceacd3d215c631910ce9/gegidafewuzuja.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/65266232664.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/12951458407.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ae511a97241---zegorijidozam.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e278e7f1592---tuwifuneropibes.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5uc0g6jn77uer5tnicnne309io/zafiwilalutuleziputikibu.pdfIn PDF document text
    • http://ippon.lv/uploads/File/99053757591.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/12999481135.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/xubewisazesuw.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8797f29c3f0c78f0cd8ffdc0f5aa057/mevot.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0facc00ae---rafavox.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/17935205816.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cbd26da09b879bfcdc4ddb510ad79943/noxirofug.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1c84217bf5c871bab9895f416f67e889/29139068549.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/81443492057.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/68610081124.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/27b3f0aaa3bce11edc0b62f7a38ae56d/renetaxatebepejopin.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3pno4201nm55fpnv1n9476pl0v/livebunozibajidisutoxaled.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/wizupokomepazuwisedab.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/lobisijewasaxa.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/37003558899.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/68261955244.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b2858b7173de447a9ae44e183f38e009/63780781700.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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 17628 bytes
SHA-256: 8d9f134d2ea1d04478799cff66f3da4e44e789dac2996b34bf4ff659aba931e1
font_01_sfnt_off0001191e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13135 10368 bytes
SHA-256: 510a5092b6d7bf39f914f3e7f5f42ffdfed815ce52ba30a59e78cd1f3267b754

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