Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf722d8ed882353…

MALICIOUS

PDF

89.2 KB Created: 2021-07-17 21:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcb0c264a489efaad2b8a007c7fb1d08 SHA-1: 30781600602a9bdd85c14d28287cdb38a86aa94c SHA-256: ccf722d8ed882353524b17fd08d61a794834c5fb186b52ca248525a1a4b0685a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://aawyx.com/sites/default/imageuser/file/nawilopaveremezisulol.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea1579f5f6---ronowizezus.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/048fbe9de83e396d7a56feb99cc8511f/72530523083.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b916472a17b---gamukokolekomadewonivifo.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f2e9471335ca69f1dcd419e44cdeeec0/fotunozesebufe.pdf
    • https://apsco.ly/userfiles/files/38832120277.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fnt3esrh3t18q1ip9mpau75b44/kaxojosu.pdf
    • http://anaminfo.com/attachfile/file/romurodi.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d12a5e5565280481acfba3cea2b43246/kabubedusobuteg.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda2f406bd---4706143115.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/249oqomlp3p792egu4l7thgu5i/71142653328.pdf
    • http://hagelkonzept.de/userfiles/file/53513779065.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xumepesafimozo.pdf
    • https://kipass.fr/userfiles/file/4203661874.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/b131a040b4bbcf5726a69845999e28c7/waliv.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7459554e3a253d896f36fff2a73f4eb9/36167175988.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e13ca6e522---rixemorovefubodolez.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9e1484f0df9027078efdca92a29b18c1/jedebajirufiw.pdf
    • http://minhvuongthuphap.com/upload/ck/files/liwajum.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/s6eaqopv0tk0hmndreu1rbukts/sexonamuda.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/19354504995.pdf
    • https://an-professional.ru/img/files/file/68211701329.pdf
    • https://businessservicesuk.com/userfiles/file/vilabebejebutad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sam+rockwell+michelle+williams
    • 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_off0000f8c4.bin
073b27e9bc02ff633b2ead7bec38e67063f8e8950ea11b359e4e20cf6c601b0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 17824 bytes
font_01_sfnt_off00012782.bin
47770b3ee05e7eaa2d25ad3be87caf3cc1a88e8109ba3faed5819ab7e4336d71
pdf-font-stream PDF embedded font (sfnt) at offset 0x12782 10544 bytes
font_02_sfnt_off00013f8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8E 16792 bytes