Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1addf2028ff9a9…

MALICIOUS

PDF

84.9 KB Created: 2021-07-08 02:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3fde666ea90d941ebb06c01957f681dd SHA-1: d52a4a08d60c4ecc910b5675a2e771229bd204d1 SHA-256: 0b1addf2028ff9a9706fdef1266542ee0785c1807b4b5a7109a3e38e7972e3dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous compromised websites, likely intended to trick users into downloading further malicious content by masquerading as a cover letter PDF. The presence of external URIs and link farms on disposable or compromised hosting suggests a distribution mechanism aimed at evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://oniceh.ru/uplcv?utm_term=cover+letter+pdf+download PDF link annotation
    • http://alpha-cp.com/userfiles/file/fasekikovovop.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0247dc9b8---81540991345.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/71868267225.pdfIn PDF document text
    • https://carlojans.com/cms/file/37351647855.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974d9f31be6---84948054330.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609caa0ac50f5---49199089484.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/tt44lnneh34g4fh8qqqrbjde0q/87264074439.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/30623b18860f932e271b1ad5559d2910/63095297013.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc949baa7eb---48569174148.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/46429176451.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/1106033338.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc189a66ac---19334017232.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4053e8e8c---ripapetuwaseza.pdfIn PDF document text
    • http://palami.by/images/file/popep.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/ganub.pdfIn PDF document text
    • https://tl-systems.hu/files/files/rikazokiza.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/edf1a233acd6757f7ef64623d4d86aaa/24477478339.pdfIn PDF document text
    • https://noddy.nu/images/file/91385289478.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d4a367125eec6e92895a4a7b584aa11f/xibedubokesop.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/175728b6a54b57d77689710d2b0abf58/nulavuzanogarexodobipapa.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704fd298c9d---pogexiwalewizavijixi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa328817d6---xidobawuvanabudubomo.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/fadizabuvezefozumumek.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/fd72ea9c2d1c2b1a34cecc98ed3f4981/63495534040.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_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16916 bytes
SHA-256: 4b819a586a6ccbe7e428a7ee3347d8b64766ee505d55aa0f8c8012c6b559aa26
font_02_sfnt_off00012ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 10412 bytes
SHA-256: e332c51733afd4e3150afe90d58a6c648e1f6ed1f23b52db19033518ac5312b4

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