Malicious PDF — malware analysis report

Static analysis result for SHA-256 35147aa6066423e9…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 23:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a03bf241ffa7ea7090e229537a21285d SHA-1: b07d4cf97818c6e3b506bb71045bf6ef4ef3bf7b SHA-256: 35147aa6066423e96b736606a27c254e3894bc0d8966fc7dba0dc95bc5909d27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious sites, potentially as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://chcial.ru/uplcv?utm_term=active+directory+ou+structure PDF link annotation
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ac7cd9651---kimogovetobodunezosena.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4f46f544f0fe0d13189c328242b87025/18372700746.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d48866de---42874068567.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/99786172421.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/d5ahl89r9gj6rkloarlnc8shm0/68879649262.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3aed4feb3---13517335872.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d1b46415ba7b22ea5e1eb8cd2b4b3e27/bitijod.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/66997233750.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/gowopukakanuworezin.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/mawetikofo.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/i9465dckbrn5pjrmf233ol14k6/rigegarafapa.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085838fc370b---19394997448.pdfIn PDF document text
    • https://led7.ru/file/89742409475.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///22315117275.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba071b41b69---40579343011.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebce8529b4---45869666746.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d0dd2e33---zabosolizoguzix.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/pibogafusekulani.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210723204141.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/97136258397d58972c96ec1a8198e559/12417688308.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/dewuwejanugefidilinaduf.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/fomafotola.pdfIn PDF document text
    • https://promise-land.com/upload/file/19210353453.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/pakakujojewekozewin.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a05ca9604bb821cd0655f5bedcc1b73a/8887847572.pdfIn PDF document text
    • 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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 10312 bytes
SHA-256: 0ced4e55598b42497d46e448fcedeeda640f0d9185da713e14ff9a3c127928b4
font_01_sfnt_off00010f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 17512 bytes
SHA-256: df0e94722d6c9eac01423ec542195a54a6509425b70d7ef1400a1776858460f2

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