Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b7d4d0ed3346cd…

MALICIOUS

PDF

83.4 KB Created: 2021-06-27 22:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9712cd30bffb5f4dc08e35428b3729f4 SHA-1: c44ef6daa7087568e68af767ff89f44ad4f2ed93 SHA-256: d2b7d4d0ed3346cd7d75cc5b469bba859eced2afce3652149b0011ba2e2efe8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves luring users through a malicious attachment to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9d2ee705---satijor.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098d39a2eab2---79213828059.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/129f8b3410f8d21f9e251d680931c444/27238368507.pdf
    • https://maggies-handmade.com/UserFiles/files/69981284657.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/kanutazuzobir.pdf
    • http://studiofapas.it/userfiles/files/67707683827.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c5a923cd1---46034251570.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/jeselexajenupaf.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0dfe651d8e12764ee3edc4baab602b8d/12504364978.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/bd5336463b56506e214af4588780a2ff/tosigusizosimetifuzim.pdf
    • http://www.deopendeur.org/imgUser/file/rufiduwijasox.pdf
    • http://aihyang.com/userfiles/file/26599465550.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3dee4d3f5---sabefifirukabapefepigob.pdf
    • http://linkingpeople.info/userfiles/file/dufozimusuxudumedeparim.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/d66095f7eb3d4622127a2cacdf980576/3003394820.pdf
    • http://atallmed.com/userfiles/files/51889570004.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/8gvk056mnle7crq44e8ukt1296/bexevumorapelati.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a00afc234e5---bidun.pdf
    • http://monkey-do.net/userfiles/file/lovitamofujegamexa.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/m754ue1lss8mkj36ale1chjgh0/39964389681.pdf
    • https://alutat.com/data/file/74345401406.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/1l98blph19bcrqqs10ii3act36/jiniselonisex.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/34178476347.pdf
    • https://5uempat.com/contents//files/27183615251.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kinds+of+asexual+reproduction+in+plants
    • 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_off0000e56f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 16792 bytes
font_01_sfnt_off0000fd86.bin
502c2ed112838661416e50446ff0e4088597cbc88208fc294babd3acbf912cc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 10808 bytes
font_02_sfnt_off0001168c.bin
e864bd2e5c36803d89bedace3e83c31d4665e8b39f6d4c2f611c76894e5ea51e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 16156 bytes