Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb6c0ac2e1a0efd…

MALICIOUS

PDF

91.5 KB Created: 2021-07-09 04:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8a7aa219779a4febebea886851ea4eb SHA-1: fc4a0fc891db1999d041733f070a7290b2c93efe SHA-256: cbb6c0ac2e1a0efd3352e7541ee054b8807688f6c916f8b8c009d23bd5f97be2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the nature of the link farm and the detection suggest it may leverage embedded JavaScript or exploit vulnerabilities to achieve its objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://khanikango.in/file/23080208404.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e28c6d829---57610272985.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kajcbqkf4bcfnriimgord2rmak/gulub.pdf
    • https://b2cexpressdemo.com/userfiles/file/lozujagixidet.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dae4ab3c5---30955843720.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb87d90533---mozitojovusavonetatusiw.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608435fbc6ad7---13436026667.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/r51ld8brh60sqj5cctnrefcov2/22718638702.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f870666c43---26652522528.pdf
    • http://sushi-belovo.ru/files/wegubegobibegozanelo.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1729337027e66e7d74fd6875a64a4e30/43444640377.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bvss519vvemobtktagf2hjq4ba/gabirida.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a401d34e98b---xivilagegipudipa.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/pojulojejufavuxab.pdf
    • http://gamax-motor.cz/data/dokumenty/sebimaroli.pdf
    • http://assistance.uz/images/shared/file/31241473415.pdf
    • http://jinxinghotel.com/uploads/files/zusuzazenuzurulaf.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/77478336820.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e5ca39815---damirodin.pdf
    • http://zwickerfoto.hu/_user/file/jibax.pdf
    • http://inbjnews.com/data/cheditor/0603/files/xegofigixixawawif.pdf
    • http://agataklimowska.pl/userfiles/file/36177333225.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084377311172---35288699300.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16097485b28352---futamigamaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=which+question+the+person+answering+the+phone+may+ask+you+when+you+call+a+company
    • 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_off000102e4.bin
5f1f54282c9896ce60f1af8f3ac52a2a86410cd02ea77b62e4dffb59590a5628
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 11352 bytes
font_01_sfnt_off00011d3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 16792 bytes
font_02_sfnt_off0001354f.bin
2e8f3889242038d2b47abe9c0839aa05291cea4814d46adc628fb666bfb774e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1354F 16452 bytes