Malicious PDF — malware analysis report

Static analysis result for SHA-256 832fea8684639a83…

MALICIOUS

PDF

78.4 KB Created: 2021-08-02 09:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: af483d9cb2dd162a38920e1608da080c SHA-1: bf62d7d3151d53f61a2036aeeb4c206c1f3743a8 SHA-256: 832fea8684639a839008d89638ac0965126beb3aedb379482e6c2b0521a89d61
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9988

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/bf95abfc3cdd6954ff171954c92bf737/gaxakazuvosilij.pdf In PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/7129a84a6fbed1b7a04ad5c932285b10/44240980260.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/sufujanujogofomavanonuna.pdfIn PDF document text
    • http://signauction.net/userfiles/file/wakoxevabu.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/18969366460.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/zawuxojukasavom.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb4f060ce---gejelupuxovemagunemuzesub.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/235d6e4e1639150ae43fc06caff2a56e/dikokavowi.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089be5fa0b4e---94694234294.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b01caf14f12---49310190797.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/gifuvejafupokidutu.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/6941821502.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/79654236717.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2281fb0b---kasiwapujogumonerewetizu.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/seritaxofixiviwepe.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3292baea0f27a3c41ca43cffd4f98e76/palozefiwusujezesikobixu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/63e460c950311dc32b5062809039ce15/27889528343.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/d8f9e6d6dbf79f95a537c9275a9b0c65/89983818551.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/zinumumirivupogixo.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/rejulidaralusu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16103851fe78da---viworikukepogow.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/liprtvjjmkc0fo2qnlb95tc1bv/vabinedikirokox.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/ruxaribifalujajelep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chemistry+unit+7+reaction+equations+worksheet+2+answersPDF 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_off0000cedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDC 16188 bytes
SHA-256: 0cbc28d6ba4fe45d01695c691ad51dffdcb646ff47af18706225cda76fd9d4b6
font_01_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 11188 bytes
SHA-256: ae62ce1b83ee3f6c80527cc366ccfe70c9dfb2031eb7c60390406c9b3fc4afc9
font_02_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1