Malicious PDF — malware analysis report

Static analysis result for SHA-256 256f338d7dbe3a5d…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 22:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a6cef2ffb3ea23ff28f574770e15ed53 SHA-1: 1be521e7eee1c43bb7fe39251a06b952cad78b6e SHA-256: 256f338d7dbe3a5db737a438a2ff5e31f24bc26a6cf6d385c0986317497f3661
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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 http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ab109ae3---96360829176.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607433a219c61---pojuragawejefirubuzizux.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3da20576facbf9e60385af592ebd527c/79671350643.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/tokenevowokirowome.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/bae7a00f5651a48c69c2dc5343f91ae1/57869709978.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/vojetubiba.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/85264124608.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/arnqla3qrmar886v46v7bbi3uh/42871767716.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/46067663b8fc2b6d8629996e85479cc5/wumewepotutikiref.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80783d092e---pinabowabewo.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/legaremikenebavugamebakol.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/kuvosugagubozubosititer.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/302d5b1ecd60ddfc31966c4bd961bb69/jekokubetizesa.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/38863671898.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ae090faa615---wosabo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dd5980f5a---76334784513.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/40476374242.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/1206ef0d78c2cdd1298e706b2a27e8a1/87260264707.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5132c2edd4c3a293ede2df87faa0ae8b/97627033665.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4b7d0452---97847330388.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/72077710435.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4e0fa15f7fae2651b0c61f1bf4d8b8d7/20987541554.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tameforekalarulawudax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7921fc66d9---47998536685.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2293387c2c---31197569733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=can+you+catch+strep+throat+twicePDF link annotation
    • 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_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 10756 bytes
SHA-256: 17d5dea89cc43c6cfe7987bc25bcd7edc70aacac731481c17558ccd7f59624f4
font_02_sfnt_off00012905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12905 16324 bytes
SHA-256: deea942fb5c580fb8afbfac2ff9c105c7518dfcadd9c67d13c5e76e1f4fdd2b4