Malicious PDF — malware analysis report

Static analysis result for SHA-256 907003e8efea0f62…

MALICIOUS

PDF

84.5 KB Created: 2021-07-14 09:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d17905cfe60f2f43fb7576c2fb7f33d SHA-1: 1c6de7a0706f1d62d1d624030865d605a5dd3683 SHA-256: 907003e8efea0f62881ca7711eaa9a06a23f66f37b193437ba159c9457151794
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress sites and disposable domains, likely to host or redirect to malicious content. The PDF structure and the nature of the embedded links suggest an attempt to lure users to external resources, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9ad840e119de8240d690cfede906ccf8/juwibe.pdf
    • https://firsatpin.com/calisma2/files/uploads/8711315809.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffa94c6587---45405335105.pdf
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/23375937011.pdf
    • http://rallyteamwalraven.nl/file/tubomatafidipu.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/699884c6c88a9a55e8da0198d165aa8d/54567625287.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d159dba06949dc93bac72838ba93dd1f/48879828458.pdf
    • http://rocb-ap.org/file_media/file_image/file/rapazewus.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8osm1go3ibfqsl2916f72fbqtl/99079305514.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44d0c8bd0b---satavurukolapejegofepejat.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9fmkm7s6dg08qcjnrcfq8m292j/5703558373.pdf
    • http://biancoacolori.it/userfiles/files/76880406074.pdf
    • http://www.tobywells.org/media/fckdir/file/44113608790.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/13be51957efde7d8ee8228e9cc129dcd/6939729760.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/13780748308.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/nafowigonenamet.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/9e4e275a9179e28977137bac1be24643/fovejoluxutijevuxufokume.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc7f61a35---vomuxenavuzatanizud.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160828ad1e8086---tejexanexinid.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e9d36cea22ce966b05fdd368d98f57ff/90109430003.pdf
    • http://picassogift.com/Uploadfiles/files/25647824419.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/190tf3rp63j6vvjc9ihuse9iv3/sexanub.pdf
    • https://amd-export.com/site/upload/file/87357413636.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=food+bank+donations+near+me
    • 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_off0000e961.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 16792 bytes
font_01_sfnt_off00010178.bin
97f21ff6db33c6744ce5a84c912ec464b53e1fb6e1e33a3fb94eadc329901eef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 10572 bytes
font_02_sfnt_off00011998.bin
88661a1130e96a8513a7b477300427f97623785e66f94db4ee3851cffe8e1b98
pdf-font-stream PDF embedded font (sfnt) at offset 0x11998 16572 bytes