Malicious PDF — malware analysis report

Static analysis result for SHA-256 9517c8172d13ac15…

MALICIOUS

PDF

99.9 KB Created: 2021-06-26 04:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fcdd5128f78c14f2e87e966b61407b2 SHA-1: 0b0fedb2deffcc5754eb1a24f8c9d58e5cc09699 SHA-256: 9517c8172d13ac1541053f9a5e59cffd6b726bfc1946175d4b4bf1d660920531
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' lure further supports a social engineering attack aimed at tricking users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=spanish+for+cocktail
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac248eeb58c---64810149851.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59b0b14436---61280487984.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/6urbdos1tlr8l8u287vj1ea88g/1293808662.pdf
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/u84u3engt85vsq259si1svr2i0/22208716251.pdf
    • http://dzbnf.com/upload/file///tomoxifitawukunatodedoro.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceaaf8ece9---kenowo.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/14e108447123ad623a4d00dce32062ff/jenefemodoneziwupumapoga.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7608732a---50502543438.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7d57dd51---59503672793.pdf
    • https://badrivishal.com/media/wugawapexepenonorutixu.pdf
    • http://xn--xhq021fvrwdth.com/d/files/97889166022.pdf
    • http://pestcontroluttara.com/ck/upload/files/55454514208.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d035907894---21579510309.pdf
    • http://mjacz.cz/soubory/files/wipurozubijulovokeju.pdf
    • http://thegroverestaurantnj.com/userfiles/files/91731980455.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/28378ac950be0099d048f37e4a6bf87d/11339590765.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7deba25c2ff5415fe504744c4c88b0a9/zubuwepadu.pdf
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/24088094281.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/0dd570ddb422d08b6a6deb438408a537/wuzakewonigijazuragi.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080db6e62b2f---19661483049.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f72e38e7f---19933143194.pdf
    • https://louvre.lv/res/wysiwyg/file/pipugedujejibetu.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c90f3e37d36---99249970282.pdf
    • http://alpha-th.com/userfiles/file/logozuvutuwipezoxofukil.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_off000123ff.bin
7b408a44cf4b8f5e5cf52192a3942d71c69a8f295cb7e93936bd1771c12d22ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 10612 bytes
font_01_sfnt_off00013c28.bin
eb5393a0fbd8f640bc850792363e127feb9ca0abb8b70b0f66b633a2c46cbb9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C28 17396 bytes
font_02_sfnt_off000168cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168CC 16792 bytes

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