Malicious PDF — malware analysis report

Static analysis result for SHA-256 976a9fdc5f7ef4d3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 19:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dd653096154e217e23719b217be2762 SHA-1: 41d88a2f946d8c268e3da560c77b443802079f87 SHA-256: 976a9fdc5f7ef4d3240662ff19db2db12fee3ac47ae08c662ac9aa34fae4f839
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the ultimate destination. The document body is unreadable, but the presence of multiple PDF link farm heuristics and the overall detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ruihuitax.com/files/file/gamenikemotilagen.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92221787033.pdf
    • http://minutemen-jrotc.com/clients/84940/File/nurorileduzatavizodag.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f013b8310a---38507564976.pdf
    • http://zrdb-drogbud.pl/Upload/file/manebavepufiruxiru.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607332f211e94---33033371394.pdf
    • https://vestol.bg/files/file/58013906540.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f961355db9---75596202922.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/jlc1r0f5mr0mtnnli6f89e2s17/48849547458.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ac4ac43192fadfef2d12319d6e789609/35431280385.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a669f4d2acf---61601150053.pdf
    • http://ultraljud.nu/bild/files/kimupozesosavepolefarix.pdf
    • http://factblogs.com/uploaded_files/userfiles/files/23685032824.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f547875783---35022131813.pdf
    • https://daulte.ch/ckfinder/userfiles/files/pajozilalarus.pdf
    • https://eguiders.com/uploads/gamuziguwok.pdf
    • http://marty-triple-m.ch/inhalt/files/dipab.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/db03agh7cam5qsk5thfm3clabn/rowovetumipe.pdf
    • http://cmuniontravel.com/userfiles/file/87494938036.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6f3ad99e19281b2508c9337859321f8a/16514524288.pdf
    • https://elperrocallejero.info/ckfinder/files/resusuxu.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16129a35c3d623---zoridepanesapixomekis.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb8a0c6762---rutufixuladulebaw.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac32a0724---36606707334.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=orazio+air+compressor+manual
    • 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_off0000e0ab.bin
d732f08f8df5634bcad05678ebe29c7fcc90d4f0e93652abe8765434518b4e33
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 16892 bytes
font_01_sfnt_off00010c40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 16792 bytes
font_02_sfnt_off00012457.bin
2ac033f4607be0a8dabd90c2f8170dcb0a67145e87862da6cc495f4de528fd3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 10624 bytes