Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e054607ffc1f813…

MALICIOUS

PDF

108.1 KB Created: 2021-07-29 18:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 451ee2600bfed7c9834de4958e5871dc SHA-1: 6db89d849f29963b6965f19283d512a81f829387 SHA-256: 6e054607ffc1f813387fc803c01cb5502e425b7496ab717658b99c3ffc3ce448
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a document designed to lure users to malicious sites.

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://synerhu.ru/uplcv?utm_term=cardiovascular+physiology+concepts+3rd+edition+pdf PDF link annotation
    • http://htygroup.com/upload/files/82439391376.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaac87d59a---43476884302.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/lonibaxi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607882d33b7a8---62351223683.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/niwerijuzuvosuwobur.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/40611760578.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/dikovowoxamanemexowusitas.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/36223067901.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/98267222646.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/21a4108edc8832b18f09f93cbc8a47ac/dezakoniwu.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/tavejibadid.pdfIn PDF document text
    • https://anaksemut.com/contents//files/92242649580.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160976bab51532---xasamifugum.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/35168726740.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47f497a90---42030790940.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/surakalivig.pdfIn PDF document text
    • https://bataretak.com/img/files/file/81194789085.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107090748563652.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/durefikezawabajuv.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b98a5705---dotin.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/27719261336.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210710032752.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210528134152_rzhx2f.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 11384 bytes
SHA-256: 94b09d9bda4c468d95be2f000684146681a7005f59661c9bfefbc1f23e1b4f22
font_01_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 19576 bytes
SHA-256: 9b3efa17b8cd065410da399190ee6c3436c56654aaa4966337ec2f5a6f54b815
font_02_sfnt_off0001594a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594A 17336 bytes
SHA-256: 3d201ab872583134332a2ec7d385570d2f9482284947ceed0a91b1949a259798
font_03_sfnt_off000186a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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