Malicious PDF — malware analysis report

Static analysis result for SHA-256 812ba77dccb98498…

MALICIOUS

PDF

92.5 KB Created: 2021-08-14 13:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 1de2557a43e0a88c6c31bc5811d08dbd SHA-1: 57452ec2061d73071c9956a8d575da95524e26c4 SHA-256: 812ba77dccb98498e3e6c14a92892ace8aee28dc642139e54b93e477de00278b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mastersequipments.com/ckfinder/userfiles/files/93737288632.pdf In PDF document text
    • http://bona-agra.pl/Upload/file/309801870.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/lufaxamorozagovazilolokup.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8e8c737e22cd56992fc215d03450d792/10354668854.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/levilowen.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1cb8c2741---34865974848.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/bawibizog.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/jelogavirezini.pdfIn PDF document text
    • http://langmypham.com/luutru/files/ruxobozujefexit.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607795565fff7---kojov.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/17681841550.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8dv6rjs634heb9oivm97s6dgfo/87475350546.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ef6e063940a9a7a511633f6223f42ae4/jafavotedegedafuseme.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/vovituwoxusudumibu.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/webawogakixovigixogod.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/zeguwarivunuxiwe.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/47147928357.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/hk2kdphps6u6844tflt7j1of3e/wigotaxikimemubipibozeg.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/duban.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/85423927931.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/sawisud.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/47051521839.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/tarixa.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bd94c25f0---jibafomokazumebawagirojir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dragon+ball+z+xenoverse+2+character+creationPDF 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_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 11000 bytes
SHA-256: 43da997c18ebdf7efed2666b556a37d0a8b58b8b27384fe401df9ed4b396b664
font_01_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 17664 bytes
SHA-256: 5a60d8b2a6e615af0a7943f4ca17d21776bc9e378da48c719338ff48e7a85e64
font_02_sfnt_off00014bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1