Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbec3f4601d8d00b…

MALICIOUS

PDF

94.3 KB Created: 2021-09-03 15:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: addfef515420821515ac34b514af8747 SHA-1: b2c500a1c97f2249de8c7819917b866f103d5c19 SHA-256: cbec3f4601d8d00b2170020dfc236768b3affaf023d4a750136c1ec2e0c5b903
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites 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 delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=le+raisonnement+inductif+et+d%C3%A9ductif+pdf
    • https://pakianco.ir/data/image/uploads/news/files/91413310715.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7ae718ab---23590216939.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f32e471d9e7---pogej.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160966f50c2566---jekupokadosamaxal.pdf
    • http://orikon.net/Images_upload/files/latevamotegipe.pdf
    • http://terezmisszio.eu/files/file/62301929310.pdf
    • http://www.alfapilates.pl/upload/file/vawovosixutawolo.pdf
    • http://yuanyoujie.vip/userfiles/file/3479547708.pdf
    • https://malashealthcare.com/userfiles/files/45637852591.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wimogakasosalebugo.pdf
    • http://broorybulldogs.com/clients/33993/File/wawederimojabogon.pdf
    • http://web300k.com/upload/ck/files/85622187364.pdf
    • http://hk-sai.com/ckfinder/userfiles/files/31466575516.pdf
    • https://cubic.is/userfiles/file/fejetikavi.pdf
    • http://abwcrainhwy.com/uploads/files/78138247603.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/68109327832.pdf
    • http://meteosputnik.ru/userfiles/file/zobeledilotanenifuvaw.pdf
    • http://zhouzhuank.com/v15/Upload/file/20216222124425908.pdf
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gazaxobufilebedibonoboxuj.pdf
    • http://beateromer.com/bilder/file/sorifitunurosogigu.pdf
    • https://heatingboiler.ca/fck_upload/file/vixipebabe.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/7uknti47sm1abul0oufpajt8th/85870727143.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/15820039385.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hg384t43gprov8i6mdra70jc76/6256653308.pdf
    • http://mistralizmiryonetim.com/uploads/file/41706871504.pdf
    • 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_off0001060a.bin
741e2cda3261120ed74122a9d8163c1573be10bfda8973fd9af5114f59f0cf51
pdf-font-stream PDF embedded font (sfnt) at offset 0x1060A 19888 bytes
font_01_sfnt_off0001381a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1381A 16792 bytes
font_02_sfnt_off00015031.bin
9e8b209748a2d95e3445003a0eeb066187f751679b09829d3571edec4f2d0120
pdf-font-stream PDF embedded font (sfnt) at offset 0x15031 10948 bytes