Malicious PDF — malware analysis report

Static analysis result for SHA-256 389ba1a565385d81…

MALICIOUS

PDF

85.2 KB Created: 2021-08-03 13:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f96fe31122d3ee3d68f6c0b94c75c47f SHA-1: 831a274e5bd5fd7c8bc136771343e267dc94f77c SHA-256: 389ba1a565385d81d0ce24b09359b80584a734d248888aa03d25d22912846908
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command, a common tactic to bypass macro restrictions and execute arbitrary code. The embedded URLs and link farms suggest the document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://inwebjor.ru/uplcv?utm_term=how+to+mute+mic+on+discord+mobile+while+in+game PDF link annotation
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j1fd696htj9aguj2phejnqmg00/waluputiruginije.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/70633194842.pdfIn PDF document text
    • https://papiratisk.cz/soubory/44791298615.pdfIn PDF document text
    • http://didula.com/img/file/tadusuvebukev.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/kiralezaxaravuzija.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/rdqikg67k1cdglp32lsvoiu3od/6276202028.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/71761610150.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55280d006---xujugubokopana.pdfIn PDF document text
    • http://esistore.de/userfiles/file/17868398346.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/sinagag.pdfIn PDF document text
    • http://polipack.ru/content/file/jakininebikojaxepizevip.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085d05570afa---bekovezamu.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/19904072750.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jh3mn5ukn3f5j66ispsp23oog6/39732132211.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/xevubexaseneditolej.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/gusapidezapewodagatukene.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/64022971495.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609189424eca9---vadisizutera.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/59545218550.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160768878f2e25---pogebelipibefugojume.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/774679600.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad89cb8054---39970167257.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/dufopebamugenevura.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eb0d91c2---78026585466.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_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 17124 bytes
SHA-256: 36d48e8a7756454fdf374370b19a2665bd899b7ce38d91f7e9038697750db63e
font_02_sfnt_off00012b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 11136 bytes
SHA-256: 4637bef211962b21ab38f3b53a0b4b2041323307617b6ba6e28cf912981e22fd

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