Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f95a9e0570d6792…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 13:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a136c8554c07318175f1964ae7032723 SHA-1: eb2c9d86c0fe275add09172c5ab0a7080839f2fc SHA-256: 2f95a9e0570d67926e71d34e49add14e87bc4cbb630e04d05a879ba5981ba2e1
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 CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic findings and URL patterns are sufficient to infer a malicious link-based attack.

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 http://anadolumatbaa42.com/genelresimler/file/2617539232.pdf In PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/73486729809.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/rarifofekonuloteni.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/nikutapazelimodezujuwaza.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/40539892405.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/xegokilusoraz.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/23613532803.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/mupuvokaburidapebubokudi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16149e7e2ab36a---29485654552.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161344fd22bfba---10652781086.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/tapot.pdfIn PDF document text
    • http://hflchw.com/upload/file/wowevibupeju.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9ee273686c8005e959b5f693a98118d9/55849304235.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613e16c76772b.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/voliwoworilavalutosudoxes.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vagipotimepurofadunima.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/likupobibedo.pdfIn PDF document text
    • http://em-ail.ch/pictures/2/42774907795.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/kojijapefamuwigamexuf.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/dazonizalewisezuvajonawet.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/50967473043.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fd0a56226e61f3fe2a04cc504bf01647/31515608.pdfIn PDF document text
    • https://chineseclothingonline.com/File/5462547436.pdfIn PDF document text
    • http://www.toptehnik.si/images/wanutanine.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/20708751618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=new+thoptv+appPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 17344 bytes
SHA-256: acdb72260fd209ead9ad74300d9d8797cdacb35707825f17a16ffe2e6aa68887
font_01_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 9968 bytes
SHA-256: cb0ef9b8c9063e5f5a606fa2b246e2485f60aea073a96386dd4c0260a56bc5be

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