Malicious PDF — malware analysis report

Static analysis result for SHA-256 7409295a4ff50779…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 05:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e21acc076354f814e3010fa2b39b09d6 SHA-1: 080cba2a08446d663da17e2fb7e05fd5bfe0a6f9 SHA-256: 7409295a4ff507796898cc94655126617fed450c001dcfe3cdcf2beb68292df8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, likely serving as a distribution point for phishing or malware. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ltptech.vn/uploads/userfiles/file/lumoxasaribilinevet.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9ea4f8d7---putisorepafakelewugalijub.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/d6c09f6650dcd59f15ddb0726cd32f41/57930585761.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/2094084097.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607972e8288b0---38826200969.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c283d46cb8c---70864347618.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/32660824545.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/35423954471.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e0f15546fd21ae65250e125a081044d9/5414441772.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab479d9e677---xuxonituxuwopikerunipu.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/vinowulugu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/9330257630.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/16484115044.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-13/images/files/kotamemuniwuru.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608544b59839b---lozukupakagiju.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/dozidaf.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/86142179040.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/tedunapofalomajutipudo.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c07b408c205c414215c952724b65628b/tisubinukadisa.pdfIn PDF document text
    • https://airbays.com/userfiles/file/25929559092.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aff9ffb6d10---giginatamomeletovi.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/77504941073.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/63414668024.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/bd4494deb21c2e2ace3e27ab202f6b0f/jagemumavokum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gate+handwritten+notes+for+chemical+engineering+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_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 11192 bytes
SHA-256: 1b42cb65c81b2573776696fe4bab7cba3eeb49466ae146b38bfc315a647fd40e
font_01_sfnt_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 17668 bytes
SHA-256: 49466932de8e516664736ffaed94f75670a0a0568e4bfe8786e9cb86b5727f7a

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