Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b6442255e5b06c…

MALICIOUS

PDF

83.3 KB Created: 2021-08-23 11:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bf588daaedf1293a25f3e417b80cac6 SHA-1: 7108ff0942ed80ee772f309ce7325621157e0603 SHA-256: a4b6442255e5b06c419c6088017d6197d653482c203a5d796b986b02f070bf48
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and disposable hosting, likely as part of an advance-fee scam. The document body is heavily obfuscated, preventing a detailed analysis of its specific lure, but the overall pattern suggests a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://crysiq.ru/uplcv?utm_term=java+questions+on+oops+concepts
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5843d1043cc9341ba2388ace5a55755a/fekujobozojudezupigure.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f13e00694---kiduxorekuxufapode.pdf
    • http://mfahk.com/upload/files/radanivir.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/kejoxigitebiramoruj.pdf
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/38237227867.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9a42eb526---kuvajibokizedum.pdf
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/27976870582.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/34ea3fc3ba2d880c0c5086c66347d503/siroborizalivisadana.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/42976438272.pdf
    • https://atiksigorta.com/files/puxixelimiwekolerila.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/pesawo.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d052267ff3f---majunamumafuvamuzagik.pdf
    • http://stopguepes72.fr/userfiles/file/1565102500.pdf
    • http://kubabus.cz/novy-web/upload/file/13737848133.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dd64ecc820e---muxisi.pdf
    • http://yonseri.org/userfiles/files/97299863211.pdf
    • http://glttek.com/userfiles/file/fukebapolalomogopo.pdf
    • https://bmw-zona.ru/uploads/file/75514676661.pdf
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/tetin.pdf
    • http://global-leasing-management.com/uf/file/97605786895.pdf
    • http://www.bash.cl/media/file/2050142311.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37bb2c656---tikusojoxakatarubova.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a3.bin
d5dabbcfe0fd7ac0ada90f6697a4f98730d0a08754112e39e5b53a4a2d79bedd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 10524 bytes
font_01_sfnt_off0000f9c3.bin
36073c12b5d4299360ea0a03dbf97a7d3be7d44131a7127ed77d69e30a4a9c24
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 17372 bytes
font_02_sfnt_off0001272a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1272A 16792 bytes