Malicious PDF — malware analysis report

Static analysis result for SHA-256 7188290d71a84597…

MALICIOUS

PDF

89.6 KB Created: 2021-08-09 03:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d31c86591dc58bbeba35f3920ca7e6c6 SHA-1: 6ecc8e330f110b1240a22f1bdeba13d027be8faf SHA-256: 7188290d71a84597a0dbfb6239e3b827fcc19ba540343a05339329412d60aee0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or unknown domains, likely for phishing or malware distribution. The presence of numerous external URIs and a PDF link farm heuristic strongly suggests this document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://prtourusa.com/FileData/ckfinder/files/20210702_33D1185EC028ABC7.pdf In PDF document text
    • http://airmon.hu/images/files/64459011351.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/13413040591.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/ad37500cf6ba2cac81e7709d1368acda/88052923272.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/50883007564.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/96573664333.pdfIn PDF document text
    • http://jarosi.hu/files/file/gasegawixojuxaga.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/kobibowuzita.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/66239672106.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4203c9ad3a---babisixomasivum.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/193bc99532f6957f33d13091ea764193/91433271380.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076371e34879---70471651523.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/h52qhgeqdenp0aeb89d27rt5g1/lodutojulabe.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/10982025102.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/ninigawowexofefisofu.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/21582029100.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021060903084573499.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/15312655be783c1aead5bd368d67dc9c/vodajasevunovafubogopuduw.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/3666326801.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/31388a7959ca4585787b28eaf38f37b6/lutaxelotakij.pdfIn PDF document text
    • https://bselink.com/userfiles/file/26611833811.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/78539927420.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/hq2pt57jrdnfe7ueo6m9flobq6/judoxebitusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=example+of+recommendation+letter+for+collegePDF 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_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 10880 bytes
SHA-256: 5387086032942c6757db206991309844cbaf0c23957f1344f2f80ab74db4d3c9
font_01_sfnt_off00011512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 16392 bytes
SHA-256: de6bea920c7852e16fcf62793b710d5ad4eb6bf48b0c169a813577db84114d8b
font_02_sfnt_off00013f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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