Malicious PDF — malware analysis report

Static analysis result for SHA-256 99083ff7cdb1d796…

MALICIOUS

PDF

89.5 KB Created: 2021-07-16 07:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dfbc12be774d0918ab7c55852ab1d72 SHA-1: 1624e4675697ffe94b910f3eb13afae581b82251 SHA-256: 99083ff7cdb1d796b6a45a629719117f0937f09c48cc9bc185b2870d09e5d40d
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a 'download button' heuristic further supports the lure-based nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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
  • 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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/urso0r832vionkkaag3jetgl22/79923878116.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60ad6f287---botog.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9994aa4d5e---31344385646.pdf
    • https://ecoretras.com/file/39094742676.pdf
    • https://jajugroup.com/ckfinder/userfiles/files/mewutovovova.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16072b2ad84b52---17286023357.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/4ad5890b0f6f430c5db6fe5eb0c9bd62/16659408092.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/87e14a08b95a08bedcd9cf811c43e12c/34803508247.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/lenavonuvumaxu.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/bewivapazaramonekud.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/59f9947b500e16b57d5e769d51f59044/tizazorukisusamubaja.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ec866841d43b20d3b87b923ace5c961d/xixonewekejasasama.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/55371686624.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/dsndh7moq668fdgd6knea0ooqv/96027121209.pdf
    • http://jinxinghotel.com/uploads/files/46471320456.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099fbd856659---58535856977.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c471633cceb---94182795642.pdf
    • https://gachbinhduong.com/upload/file/roxavunexe.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992186e6d66---vipujuremoxajodagurifowax.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/ripadalobejiziruzapuku.pdf
    • http://bahattinburyan.com/userfiles/file/59006492080.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/27qa21h8c4f7n6vieebraasmi1/fedananuziguxozoru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=moody+blue+lightroom+preset+by+nsb+pictures
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c4.bin
bb829dbc3d00af64ca4c19f3b9b3d8c842b4ad0e3f905a3fca70ba14479348f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 11148 bytes
font_01_sfnt_off0000fe3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 16792 bytes
font_02_sfnt_off0001164c.bin
6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 16068 bytes
font_03_sfnt_off00012b68.bin
886376e221eb3bce4d1c19cd9357a3a3178ab916d1c8b120065576815dc12c97
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 16564 bytes