Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2f3945820d1ece…

MALICIOUS

PDF

86.9 KB Created: 2021-07-06 23:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2924815d77ba7fceedf0d9820b48fc9f SHA-1: 1ac931e19d819ef8dbdd3ce7a8818da798a2a952 SHA-256: 0f2f3945820d1ece38ac5f060b7150e0de8ae5144ac858b0a8c60dead72a3ea1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces the attack pattern of directing users to potentially harmful external content.

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 http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b64c415f202---74835321343.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/wovobogenatedirat.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8cfbd1824bee35104b1a3c8047a458b4/nawuwalanu.pdf
    • http://beastyenergy.com/userfiles/file/wominuzenabibuxugeze.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083749b1bd5e---merimokubef.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca221a5a0---sakukibujitav.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3d2061abe---migaworax.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3a33264d---metatoforotukoxunezoxibof.pdf
    • http://lws-realestate.com/userfiles/files/21729294438.pdf
    • https://audit-advisers.com/userfiles/file/2055399361.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/fb2fa355d698e5e5c2c8a87abadb3c50/xofurunexutomuvemutezom.pdf
    • https://aimara-bg.com/userfiles/file/10453022327.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609af70f2cf2e---mapowarenafijotoj.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/88080b56078203830b647cd334bbab5d/84619578952.pdf
    • http://nowyhotelik.pl/userfiles/file/29047031908.pdf
    • http://gdgom.com/upload/file/210615020113309136g0ngsg33lc12.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/38931026580.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fab7ad70c---26210806383.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d9bed2f75---sojesivewujapipod.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7eb669198e6ef26a7e11dc536ddc524a/gifopug.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6432831570b91782a711c05fe8e68c0a/15926265676.pdf
    • https://0900107678.com/upload/file/webomevebinuwilanukofu.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160ba986d9129e---mebug.pdf
    • https://medtek.vn/storage/file/66532903473.pdf
    • https://proxus.nl/file/33033133128.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pain+in+my+right+hip+going+down+my+leg
    • 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_off0000f264.bin
4102e4db15909d4471d87269e8ba6c8acbc4794b0c1c00494859387b53d9b2bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 16528 bytes
font_01_sfnt_off00011d14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 16792 bytes
font_02_sfnt_off0001352b.bin
25f86acb635857c725fa484572b84b8c7fa9ca2c7f568000a0a79e2571f151a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1352B 10872 bytes