Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d96de3fca66c077…

MALICIOUS

PDF

98.8 KB Created: 2021-07-02 09:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1657b09436fafa482bcf68f4aa5c0e15 SHA-1: 918713bc877be05a034f454e3e1caff856881ba8 SHA-256: 7d96de3fca66c0776c354e67a70ac0d1bbe1f49b03046227da3c69a13c855c62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified the PDF as a link farm pointing to compromised CMS upload storage, suggesting it's used to host or distribute malicious content. The embedded URLs, while some are marked benign, contribute to the overall pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759d916e73c---lowubosona.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c663ac42290---dekesin.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/tizusolutoz.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074a17ccf447---94629369714.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/88773837551.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a501e80d81ff8064dbda525cd837c96c/70587769625.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/977b5c0c2ce5a6c7442271aed681b3a2/45392817703.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e9e19df554bdcb3108286b13aac11255/fifepiwirunabano.pdf
    • http://asupuro.com/user_data/image//file/14696658603.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/svu7m7vj7dmk707vs9kib586rp/89901464810.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0228725db---28529398804.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/c2tejs2ej3ajp7gglnd9ca8sau/gowajo.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2461601489.pdf
    • http://border-inn.com/CKEdit/upload/files/77697916466.pdf
    • http://inezorviskids.com/clients/37546/File/loluxetekeze.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tm9ts95q6mkrujms93ht7mcb51/72925529480.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/72a31f5e107a67164792d3c41682e7f7/ritet.pdf
    • http://finproekt-msk.ru/userfiles/file/56179916861.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/ritile.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926345c009a---74277623497.pdf
    • http://omonetach.pl/foto/ilustracje/file/sixujobaji.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e64b413359---35873697114.pdf
    • https://nocenzura.space/web/img/podborky/files/92192374784.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c614f81b187---kalijevofiliput.pdf
    • http://rencontres-icare.org/userfiles/file/ribabafop.pdf
    • http://asesorgubernamental.com/images/file/95153468088.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=women%27s+ovaries+removed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012061.bin
e1c37d5e29deb496e4c0bc2dea66fb3045d5af2ddc9d9916148381b7a2140060
pdf-font-stream PDF embedded font (sfnt) at offset 0x12061 17672 bytes
font_01_sfnt_off00014e1f.bin
01a945d50c7d5c8340eca3ebbf70727b730dda802e91a84d25b0a154501c9b91
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1F 10360 bytes
font_02_sfnt_off0001658e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1658E 16792 bytes