Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53ec2eb327991f0…

MALICIOUS

PDF

89.9 KB Created: 2021-07-08 00:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 644b944e8580cdaa363b0eb1432b6198 SHA-1: af5884a8b719327ff7d93dc7d505593d4c32c0ac SHA-256: a53ec2eb327991f063f60231376b920894e79fe9256d3ab56b4509e54e79bbfc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ML classifiers as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://garglob.ru/uplcv?utm_term=fire+force+s2+ep+15 PDF link annotation
    • http://sushigonewildtogo.com/uploads/files/82270933498.pdfIn PDF document text
    • http://araonline.hu/uploads/file/29010020911.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/839f1c5b58954bce29516346b0ba4924/siziwatifeloragelo.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/24483117981.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/89686124411.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/vupoxasubatatolat.pdfIn PDF document text
    • https://computerzone.pk/file/zilosutenutega.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0crutsmq2at5cdn408qov1bve/bopivuburelumavabukiripi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db08cc4c98---julewiwamo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/mizoburas.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e122727e743---57864626258.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/buzofere.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/121642516323.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/64062174922.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/78117129528.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607816729e892---63586202325.pdfIn PDF document text
    • http://partnercable.hu/files/laxokunuso.pdfIn PDF document text
    • http://hevolta.com/upload/file/mamugaruwatorula.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bd41b5f6da768aae526e4af3acb7c66b/pufitupadi.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/galusagagugebafil.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/77433230243.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/32c3a2f14c29689fcd28bc525c0ee83e/vapimebanipevalipunekos.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 17200 bytes
SHA-256: 0d75c3c3653b3230161a03e32140be3ce5c2896f72b99d36da94189885f9bc04
font_02_sfnt_off00012abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000142d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D5 10348 bytes
SHA-256: a1979fb72f27415356ac8d91868bb56d5c48b91316db381c30c0419a3799e5a9

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