Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8f9c6b02175cb6…

MALICIOUS

PDF

91.4 KB Created: 2021-09-01 05:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d38848e51db5c6ea4e59154236ed7a85 SHA-1: 456dcb98677dc080c1f80647c06c6b11e4b6d52c SHA-256: 9b8f9c6b02175cb66cf5d0e09817f01a267966542012472b2aad596e1eb6035e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings clearly point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/a8hvnqi1a5vc3u6kf5e6b15qse/26634677548.pdf In PDF document text
    • https://ultralloy.net/upload/files/9140094362.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/97092273179.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/11445864490.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/65330315239.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/5697407533.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609287a1c6409---rekirisusekidajipesapij.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1cff859ba0b243dab78947e3846157b5/72100518826.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf65db08563---94672389757.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/38600698164.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/58453626355.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/83424590530.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/36083074147.pdfIn PDF document text
    • http://gardatrans.com/content/Files/59407728258.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/47171536080.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b764a4860f746fcbb81189f625be5ddf/21759752207.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/98670724285.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/69845510828.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/21786371746.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/semufipewifojilojamapusi.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/knkkrohhgt601in3vi3l0c7rt7/87474440302.pdfIn PDF document text
    • http://lucann.com/Upload/file/17428243233.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/20342393871.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wanelakofufibinelananaduj.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089af96518c5---76704676048.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/82687604832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=2019+tamil+monthly+calendarPDF 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
font_00_sfnt_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 10944 bytes
SHA-256: be7b36f70c1b9267d15b89eaa8171ee766f8167c4c1546f4575ee73d69378bdc
font_02_sfnt_off0001110b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 21724 bytes
SHA-256: 5c0f99f54b3c8ebd50af320769a9f2d287c28bd84ec4ccfb2cf4dad0dd720564
font_03_sfnt_off0001486e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486E 16380 bytes
SHA-256: 315c54900fe11c429f4d008b4fde334e1a070d90a0d9658baa5848311477d534

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