Malicious PDF — malware analysis report

Static analysis result for SHA-256 6849192c546a761a…

MALICIOUS

PDF

90.4 KB Created: 2021-09-15 16:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40adcb0298908f90130739c7ad3c806a SHA-1: 5fa059a24686a6a0e65b0414bc7266b05d00a670 SHA-256: 6849192c546a761a9ce05af53bee0698229c8a871b15c1754359ce83d1c17107
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to potentially malicious external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://kruengrangthai.com/files/files/tizojokasumawexa.pdf
    • http://irvine.songhakbbq.com/uploads/files/gawupefipuzanefawuvusa.pdf
    • https://www.gurgy.net/ckfinder/userfiles/files/25677088055.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/44f2da96d593619e1fe8b76d8c89c7fa/32746311905.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0ab76396fdadf330a8567203f055b47f/xupoj.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161370d2ab6fa4---botigakakewojepavozik.pdf
    • http://sunrise-photon.com/upfiles/editor/files/wivolozezegogusad.pdf
    • http://www.anaja-inter.org/public/file/82988239242.pdf
    • http://cobmedia.hu/include/xijigopipiritetel.pdf
    • https://nhahangbienhaitien.com/uploads/files/19742827373.pdf
    • https://brs.jo/userfiles/files/7161419715.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/xiput.pdf
    • http://quangcongluc.com/upload/files/89306690504.pdf
    • http://autoscuolepintozzi.it/userfiles/files/78262742934.pdf
    • https://ecotranslation.ca/upload/editor/file/taxanijixidijan.pdf
    • http://www.pvvc.cz/files/nowebakapibinujubi.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6de9403e52bdace6ed048f8680145e11/zatogodalabutix.pdf
    • https://netwindowvn.com/uploads/userfiles/file/96862794341.pdf
    • https://cukimentescukraszda.hu/files/files/gumewadaxu.pdf
    • https://theurbanthinktank.com/files/vuraburanidavutitilulewu.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161414aebd5ac0---sakakevuvowogojiwipe.pdf
    • https://bruceautoservice.com/files/file/rikoda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=d+day+mod+game
    • 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_off0000fe66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 16792 bytes
font_01_sfnt_off0001167d.bin
0eb04cb6030bc9a0c3d313da747067f91646ae085cab14f6c01554e97f3dab59
pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 10100 bytes
font_02_sfnt_off00012cc0.bin
b4b8675f1eb91d7ac324d2ec85b266c75ff55ee4f565ab926cc0c454a49da29f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 18416 bytes