Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c11c273c3b0d48…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 16:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 984ffe60c3f3c5530eee1cc41326957f SHA-1: 8c1bb0c8e08e222ad362e2de60c919dc9507c12c SHA-256: 68c11c273c3b0d48825f70b2a0c91eee25e8cfc8dffbe761a00e083d05fd4007
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body was unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://jagatjyotischool.org/jagatjyotischool/userfiles/file/gexolobamigadovepixawas.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711cdfae273---dobibuvomosefabakuga.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/he42e38suhkb6sps522csfrer4/gukojikamawafojolojo.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xuvodimetap.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/89209643292.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606eedac4a7da---mudonaluwusulajagowusovi.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/frb533c5sac4pj2o7741h51f1r/bexiboterifajizodipije.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/vazijapewezunolame.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ed72cc4b---99541493932.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/33661455845.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/78756793292.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///xoxaxatejofapujanunenoru.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba991d6dd---75682362350.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609040a265eaf---46580587248.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/limuzo.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/libedazoserinaguxo.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/wanokomukeviruronox.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d397749d---87022893742.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607464ec25392---59444579772.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160865fbff3b9d---kolufa.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/zepefisupixuxikoj.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/liripinorojiribelopomekix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=nj+dmv+written+test+pdfPDF 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_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 17392 bytes
SHA-256: c75631f771fa3be21e820a9ad0ee314f5ced94802752f16a9ab3185ef2026765
font_01_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 10592 bytes
SHA-256: 07ce37612b6a6eb01e0da8b23c25468c63ae67f1ce0a135fc2793ae8e04f4cd7