Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b49e25843b3d04c…

MALICIOUS

PDF

123.0 KB Created: 2021-08-02 04:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e0c1d40d3380a2f60bfeca97e7b8ae91 SHA-1: a4922610fa05cee8a3ecdd96008640e8297fd4a5 SHA-256: 3b49e25843b3d04c2af6a35f9a2d1c79f42f3f1327ad6723d3e88764969e6aeb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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://watertorens.nl/userfiles/file/muruxinudegedajusos.pdf In PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gavulevorodoniresusojino.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/pugisozumetonukawu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cb5f3a4c7---16679199285.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/8226208122.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/63c63e4149d2bc89eca1c48388505baa/viveverapoliranapigudaras.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dnpmiqdhnifbkkqcui9aa4vb11/sovibakezewipisojikugix.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/safinuvegutagitilunibu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/af48188e08ab9f9bd962128001541285/bugoteropelu.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/80576883209.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4nbc548kfmtlbakh1si45k05q3/80097020840.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/98631205810.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/85922691286.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/11972222307.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kulagowovowe.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/xabiromaxadarefa.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021630140503907.pdfIn PDF document text
    • http://adveotec.com/img/file/72653882410.pdfIn PDF document text
    • http://veno2.com/upload/51306431204.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a8758dc1---xamonaxodazaduvibemu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6169b45831---39780611432.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/b0kqo39rirbgvu1ost07rrpqb9/dotizobolemexibumaguwip.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161002eb071bc1---63423902400.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9vf027eh9bg850f2791unkuv1/gurunegejidizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=top+10+pokemon+nds+rom+hacks+with+mega+evolutionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015298.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15298 21912 bytes
SHA-256: 5eab8f727afce3026681f32aeac666e27220012ab5242097be4096df01e08c40
font_01_sfnt_off0001797b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1797B 17452 bytes
SHA-256: deb247a20faffd873da49300d6ea14d00230677e7566548ae9fcc8d6d46a78be
font_02_sfnt_off0001a746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001bf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF5D 11444 bytes
SHA-256: 02989af9604c5fefef4b72f98780d62f1d955c658e78a01b6b644358c2abf488

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