Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f6db2db38b3dc3…

MALICIOUS

PDF

89.0 KB Created: 2021-07-13 04:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 523616d68ef0ab899b7a3bb7fdd2aee0 SHA-1: d6e64bbb284e2c11cab0cdebcbba49c19673c733 SHA-256: e9f6db2db38b3dc3d1806d41d78a80210ab33050964932c4ee90559a850d5284
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of external links, many pointing to compromised WordPress sites and using IP addresses, which is characteristic of phishing campaigns aiming to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the numerous links suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archism.ru/uplcv?utm_term=biggest+film+production+companies+in+the+world PDF link annotation
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bdd16beb7---93681070943.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/21311fb0a60e575c9b1913ea262565a2/78746688837.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/liguriwowelanuzelipu.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/43943557591.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/64386074058.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/ca51d4789369f1a99017dbc8fb794c51/febewapatitenetuno.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c661604c2---rexapabigowal.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5e8367bbf6ccaa8a4feab068fc26a13c/47179875394.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d228d0250---95129567182.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/krs7sb8p4qm0rbb9mc6mbe80on/zuwavinopobaw.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/xuwuv.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/29197ab0632ce7a47e931220db2ee124/96357062753.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/nenepitevinikugan.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609631799ca2b---32816078985.pdfPDF link annotation
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o677vos66vvq2sqseianj691p2/penirudowaxun.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9a8726ecf475d5c0fb5607e7022fd4ed/pininexiwegufuwivono.pdfIn PDF document text
    • https://t2sc.me/userfiles/32708678701.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6414917374---96310236476.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/xorudusodegufod.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd7850be7---fitupakexokuw.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/6410400335.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/89354716932.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/86d7a17735f53f304a39338f8f6d1e8a/mufetaxojazofexej.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/73c9d3e433d7f92fa1164f95ffb7893d/xujadefopixukifu.pdfIn PDF document text
    • 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_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 11304 bytes
SHA-256: e23a44d5a1cdf9c5207d4437a552dc4dddcd672dd026caba3103fca6f9edda67
font_02_sfnt_off000128b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B5 17528 bytes
SHA-256: c95a30a6de2c5f79d72432517c30c4dd59af6c9a3d5154e9c298f0176352d644

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