Malicious PDF — malware analysis report

Static analysis result for SHA-256 083a0c296b7deac9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 22:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bbbeb0639bc2072048d1d168d4b9cbd8 SHA-1: 969b0a49571bfcc1986d9dc0506c2a87da8eae12 SHA-256: 083a0c296b7deac9e540cedd35e74d0f13b2a3d55827943163afe7cee6349d0b
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command, likely to bypass macro restrictions and execute a payload. The embedded URLs and link farm heuristics suggest the document is part of a phishing or redirection scheme, aiming to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://philabc.ru/uplcv?utm_term=cara+mengubah+password+wifi+di+android PDF link annotation
    • http://bckbytow.naszbip.pl/img/upload/files/15316308646.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/jetopej.pdfIn PDF document text
    • https://ayurmitra.com/files/file/gedabizagatojopewejolar.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/66023030342.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/91295404892.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/86346162338.pdfIn PDF document text
    • https://j26clean.com/upload/files/tizawe.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/lutisil.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/vajeziwosikupudeti.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139bbe7bc5de---68855897523.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17ea79d18---vogijadaxofitagapa.pdfIn PDF document text
    • http://trieuduong.com/images/Download/4695634821.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/fafatimipomatipeleke.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210910083713.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/rozewijikuwa.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/voguvirisudezuzumepive.pdfIn PDF document text
    • http://amandamaitland.com/images/file/35676304705.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89d5ca84a---60014284657.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c40ad006c1ee92e6bbce0775f2576ca3/38046369603.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/67676818390.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/30025428948.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/texemedezenad.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614514ba7b503---2755388797.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/luwevofojawefexo.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_off0000d4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 17720 bytes
SHA-256: 720828a3a956547215592457528ef0c29ef2cca8c07d452897aea91dbac9a23a
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 11156 bytes
SHA-256: 600f5ee73a1734de6a09a0e75314d7381b018e3c9899c22ee48a6f0889b93740

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