Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dbec139b33129e…

MALICIOUS

PDF

83.6 KB Created: 2021-08-03 16:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c713bd427ebfec4edfe0a0cb2983ede2 SHA-1: d9c4757617555cf832eb11950276cf2bec1a335b SHA-256: 78dbec139b33129e4079ddef81aff01de155e90e5e5a8d560bb2b28e291d244b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs pointing to other PDF files, many of which are on compromised CMS uploads or disposable hosting. This suggests a tactic to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://villa-carlshorst.de/sites/default/files/file/24400723987.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/85102379109.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/sikalasepiwakewi.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/49069464940.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/16975051161.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/difozimetunesogojozijaz.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/60dd38d320b5686b457a08e279319d19/87771388452.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/lezopajafovafiwe.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab63e17677---sadurojobobufanoxe.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/59923256298.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/wejevet.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/13185475251.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffc930566---36386370383.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607844dda60e3---79434063106.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/aab551d5694fdf0af1c5d2a076609a35/54750116930.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcdea85e2a.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b4962d690a3---zesawu.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/tupusof.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/gasodedapaw.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27b2178bb---67541839402.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a1784e1af439086e13813baf730d6e73/moriketiwiwonete.pdfIn PDF document text
    • https://luminex.pl/upload/file/kanomazulabuvoz.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c20f4e737fd37dee0f139aa7fe609101/ginoxarefemik.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ejbvg02sm5t2qactge01chvrmh/84626501470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=contingency+theory+in+management+accounting+researchPDF 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_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 17164 bytes
SHA-256: c2743a25d517b1c6ac25cd1cc66296602526bca9bbfd2fe102f230dff9eccfee
font_02_sfnt_off0001271d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271D 10876 bytes
SHA-256: 5d21a67e142585f1e2ce7a096194fb2480e5aab19fb7ed87c820dc58428a13b0

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