Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa61bd05d13fb77b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 07:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fac9508c39910d31320a8e8f99e35763 SHA-1: 39aa83d39e7c898e7da2f7c1e57126cbc84c76f7 SHA-256: fa61bd05d13fb77b4259a917fabcde2f2034625d388ca48d0a62774df4f83f9f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised or disposable domains. This behavior is characteristic of a link farm used to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rheinmotel.com/userfiles/file/widisebadamopijowu.pdf In PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/vomijurutajube.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/vafaxeguwemenunubupali.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/klgevioaa244uev9i3s7h3qo90/95462904903.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/sigesiditejirepovonotomen.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a0c695014---31580146520.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/44616142945.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tgkrpbndomg37vc1oscupdn8ip/56468904782.pdfIn PDF document text
    • https://samowar.me/userfiles/files/jijanuw.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abaebd715f3---2873876604.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5c53d44a---rilazobiro.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaferirarikedux.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a478b545de5---91595631579.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/joduda.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/sijerosilulozijez.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/jafufozegajupagu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c7540edbc21---nulenobag.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/20267935429.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/293d3e2cd80da8bc41ab6a186dc7df9e/87817746848.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/zukukigiko.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/60267457545.pdfIn PDF document text
    • http://halanmilk.com/upload/files/38372331399.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4a90851f---laditiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=usp+85+bacterial+endotoxins+test+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9A 16340 bytes
SHA-256: 297807be61db90e59d7cb0fd2e78263d08bf610fa5249e857b54918a8670315a
font_01_sfnt_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 11204 bytes
SHA-256: 375a1af7777fbffa244b4c23ce271ebbf135758f496adc9b062fa7aef5acaf5e
font_02_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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