Malicious PDF — malware analysis report

Static analysis result for SHA-256 495cd2bdb31ec109…

MALICIOUS

PDF

81.3 KB Created: 2021-08-27 15:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 75e2db430bcb48c09ba9226dcff792e3 SHA-1: 366e0eef9a42824fdccbffa3519d8dca53e21ee3 SHA-256: 495cd2bdb31ec109b44169ae430f83ea0c060bead237a131902cb14928c2d646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure itself is also flagged for suspicious object definitions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hobbes-group.com/upload/files/56619849081.pdf In PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3fce921e0331f2dee2b24737f4ab7c22/wanad.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/95278213407.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8217047be540429e9876e4a898ac2974/49994947762.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/liweduveso.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/582979154.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/sajamutetasakunedo.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f83a346a---xatufoxusudedi.pdfIn PDF document text
    • https://mollis.rs//files/nivelipevikewitati.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e49b4c01891f216ff4409cc0f4df62bc/49528187816.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/65148015600.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/petuliwiwizosezijaxir.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/23779879532.pdfIn PDF document text
    • https://hssanesteban.cl/files/86220227805.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/sewum.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5627083acf---1184677633.pdfIn PDF document text
    • http://cecev.com/stockages/files/tukapoxobuvorizor.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878f15a7343---sujapexap.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b78f626f43936eead014cc7360c2dfb5/gotowizajikeluv.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161285b5b97495---99727358078.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/lf2km40ft7bl22e2nvqd7m2vnk/zarivewapalusutuponos.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/71076351623.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/96339978051.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fm81f9uu3prkvm24er3hk2g1p6/rezijadixixekudazorilodur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=my+name+is+yoon+by+helen+recorvitsPDF link annotation
    • http://www.amazon.com/name-yoon-keats-illustrator-award/dp/0374351147Summary:MYIn 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_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 18384 bytes
SHA-256: 22c3d0e007f9e07f3777da87d599ccaa1630b1498cb3b5350c53b9e866e5a1d6
font_01_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 10808 bytes
SHA-256: d95adde44db03c955e717dca1d015dc0a7e14d55dc142125bbe1234fcc63e70c

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