Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c62bb7c9c82ee5…

MALICIOUS

PDF

91.5 KB Created: 2021-06-29 19:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2231f0390f8b0b11fe0d3d57f17d130b SHA-1: f9a1b9e1d333a339814bdd1c1e8ac69b4352238e SHA-256: 46c62bb7c9c82ee5e3a20554d8519005ea9bd5db47a41f65fc250d529baa88de
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous disposable URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information. The presence of these links and the overall structure indicate a likely spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=trade+like+a+stock+market+wizard+pdf+free+download
    • http://www.77ice.com/upload/files/90172348031.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086db8378044---xabumevetom.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086129f6ef4e---32553973009.pdf
    • http://esistore.be/userfiles/file/47704574190.pdf
    • http://ubest.ru/images/file/75535203086.pdf
    • http://lawngo.net/fckfiles/xasidojemirozaka.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c506316f7---wigalusibadun.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/7ldbrutvhqbosso11v4qr21bj4/valabika.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/edcf34b70e4915263c00bb09c8d10761/82370705188.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c347055---vozomoxesuf.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e189c377da---62958495626.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb9d4d4ee---ribabokibikixifade.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/tfhsa528ld4svauh1cv23f6pai/sisezuxudetale.pdf
    • http://teplolux72.ru/upload/file/zutobonu.pdf
    • http://yaqeen-eg.com/userfiles/file/29335557069.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0f2f7e7f30d67bcf4e912b9d7c59d7ce/63017967698.pdf
    • https://jackyrouxmethode.com/userfiles/file/93878559932.pdf
    • https://bluza-shop.ru/content/File/30873419025.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c43975f0ceb---kunabor.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc134ad7da---88603705055.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094c72453fd9---xudusadekapudakinasamupok.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/sidl46ddt41fi3ech6sbtciat7/zonizib.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/n46bo7r4qavvj1b1jts4nnflvh/vovukomuxulirikawoboba.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a1.bin
67a520f536759ed02bf0a5e2d917cb44bbaea6a5342e42fa4fbf5b48290c21d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 17728 bytes
font_01_sfnt_off00012ef3.bin
f0bf0481ae055bf40653dce6f4acf2b704ad084ec2086e4f5adff5bb6cedf8a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 10984 bytes
font_02_sfnt_off00014885.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14885 16792 bytes