Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4357c79889921d7…

MALICIOUS

PDF

123.5 KB Created: 2021-09-05 00:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9504df878fafd038c04233364760d903 SHA-1: e789a646440e8f682093603164728b3cbb04dbf1 SHA-256: a4357c79889921d745b71f797a11fa2143fbeafa17e0488829365366d206cb9d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites, and one URL includes a 'utm_term' parameter suggesting a phishing lure for a service manual. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt the user to call a number in a billing or security context, a common tactic for tech support scams or callback phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=delcos+3100+service+manual PDF link annotation
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894e5e38a31---dutaxizelozamir.pdfIn PDF document text
    • http://bienbao.org/uploads/files/16615043101.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/09jkb3i3nfu2ogbde6dhv7ibbi/91071911683.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9713966234---45474116614.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/18680640006.pdfIn PDF document text
    • http://skrn.cz/pic/file/sudebojiwulunemosesesida.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/53458836897.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3febecf98807821c4579aae2e5b8b9ff/kosolezapuxod.pdfIn PDF document text
    • https://anfauglir.com/images/file/tesube.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/12052603667.pdfIn PDF document text
    • https://deepex.hu/hirek/files/xuzikogirot.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bbd75c7a---43710933126.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/99282410964.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/23945090098.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac2fe16d1---1573653661.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/vigumakojimebijugadi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c14757b46---sazixodudedizugo.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/83638136928.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/kofegodababonogodini.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/56220687730.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095210b57790---bolula.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b070f14d7f5---saxudawawuvonawuzawizalux.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/635725f9a4a7bd64821e69792244f366/lotorotipewukujiwi.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/2817739341.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/xopokobapajederoxuj.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9a3c6a486---77432342865.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/tusatidubuxalopimu.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_off00017003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001881a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1881A 10808 bytes
SHA-256: 20563262b82e22809b340a73f440b96e2f3cbc40b8022908f03e4f315756db00
font_02_sfnt_off0001a10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A10E 24056 bytes
SHA-256: 2885283e17c698eca46c638a54fb6e5f7e3397ad7bec7b9ec84cdaaec2fa2b51

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