Malicious PDF — malware analysis report

Static analysis result for SHA-256 3becae817d927bf4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 13:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e80abc71f6640f65f723d7f1ed257645 SHA-1: c15445dc66e0d784ce846bcb2f130544dba915aa SHA-256: 3becae817d927bf47125fdaa111b18c3b102cfa8c2a596d46be90975ce02d8de
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, but the presence of multiple external URIs and link farm indicators strongly suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medgal.pl/admin/ckfinder/userfiles/files/pelivisopafuguwozumipe.pdf In PDF document text
    • http://ugrctrani.it/userfiles/files/86048595428.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/98269118191.pdfIn PDF document text
    • http://bjjiffy.com/upload/jopoxojokomolekoji.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/7985531541.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/69810191544.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/mupibajeg.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4c9d94c8a8317b793389ee1315be08b4/19587824674.pdfIn PDF document text
    • http://findusafranchise.com/files/files/porijedo.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/bufobagifodeg.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/podokemu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161406557001ff---93487274863.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2d2aa9ef6dca3fad2ad6ceece95cab48/lonamililagij.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/2692782786.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/93815363851.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/22456183294.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/puregovonafelatabisol.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/86472057260.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/wegijisawezowikizininuvav.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413f24c2759---samumakivimisajoputume.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/59dc7883feed0ae12e0c11ef314b6883/23836475366.pdfIn PDF document text
    • http://yilip.net/userData/board/file/10664460193.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/fenizidaderuvojofilazon.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/sokap.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/38663878245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=jagdish+lal+hydraulic+machines+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_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 17368 bytes
SHA-256: a48145d13561e4fe15393837bb5f024b512f873f65db3c5f27793ddafa9feb35
font_02_sfnt_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 11052 bytes
SHA-256: 8494af74f64c5d0486abde3fe704799603c2ae0046e7fa4287ab51b8a5d02ab8