Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef83ee3abfd4362…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 05:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fb88eba88ccdd3f44b7791ca0927448 SHA-1: ff8225c8000e4aaa2b8929c503ba515604542866 SHA-256: aef83ee3abfd43628731bea3946c42e70011031f2f5fb6dec6f2ae38527ef944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links are likely designed to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://coretry.ru/uplcv?utm_term=stabilizer+kamera+apk PDF link annotation
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947f654a35---93258224693.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210909_69af9.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/92528760483.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/mepaji.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/41840687519.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/tovopimufuwuz.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/foxiwozukuzanaxobuvobot.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/koweduvoxugegavaf.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/daxizudalejizupeb.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/36d807c235c9ed493f5f30c94746dc8a/44324352627.pdfIn PDF document text
    • https://istanajp2.com/contents/files/85439844052.pdfIn PDF document text
    • http://ahknchem.com/upload/files/zomokofu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b71859d3fa33eb5bfb21c2aaf1a980be/kuvamojuporugurinuwo.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/18035038478.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ff3425aa37e50f1595e5602da71c3191/9761205527.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/86242059022.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/gavisifatonupuvurepe.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/napamabexen.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/97278477469.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/92438960257.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/kixafudamo.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219102357117549.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/67028804977.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdd712d92---4366668966.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/piwaroga.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece7308dc3---37258597487.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_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 10388 bytes
SHA-256: c8dd397387eeea62440bafc46fbe61585d9ffcc7c9f165a067fa517e4872c477
font_02_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 18576 bytes
SHA-256: a0cc345049f2d3ca47ceaa31bbcb4bd986aa6c5e5f4adb5f143b3e3e0204a438

Open this report in the interactive analyzer, or submit your own file for analysis.