Malicious PDF — malware analysis report

Static analysis result for SHA-256 44260c40da7e7ad1…

MALICIOUS

PDF

93.3 KB Created: 2021-06-29 18:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bd43ca65abe607e914bbb5bfd164c0e SHA-1: e80c6c725f87fe3c3f7485122d6cfc7eb11e8160 SHA-256: 44260c40da7e7ad11ca2f5a33ff59df7cb12caabd3c1dfb81bd310afdd7a761b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. Heuristics indicate it functions as a link farm and an MFA lure, suggesting an attempt to harvest credentials or session tokens. The embedded URLs point to compromised CMS uploads and disposable hosting, further supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609422d1887d1---32962102961.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/272db3dbc0f923dbb662de86bf93a279/xotimumunijaduximogifu.pdf
    • http://epsilonsigorta.com/files/jafifajifobefusomij.pdf
    • http://alessandrobelleseveterinario.eu/userfiles/files/ruwavirugenelazobaw.pdf
    • http://erex.hu/upload/file/kitubogelivanimufutamikuk.pdf
    • http://gramercy-grand.ru/files/file/tudij.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210527193130.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/vozakemirag.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc62901517---xorulixegodu.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/qbs61kjsldl0rovajukjotplv7/joxokopi.pdf
    • http://moestuinwebshop.nl/userfiles/file/vofam.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/dc11dd9366322f3c9b158012883a69e2/70000029011.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/8a355d73e28bb25da48e2f546f1e447f/kowokakewarulunotuwi.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cefd83d4f79---taboxivugelurejas.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bba70021fc9---87541818193.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7f2f9ededc86263c55bfbdb9ae8d5ea6/67034454694.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8a32b7cd---69993956245.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/53569482260.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ab4ab3a8b5cd1194b16adad7f34b935a/83026366658.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4817ab0094---93992984784.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a9eb8392a---xekugoxokokisudur.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc18849f3e---xixirotivalasupa.pdf
    • http://malbreil.com/userfiles/file/71543804864.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ppovmo8sg144aa6q5vgj9bql5j/tisaninomawowedazukozus.pdf
    • http://bocghedanang.com/media/ftp/file/deguvul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=real+visa+card+number+with+money
    • 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_off000106e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 16792 bytes
font_01_sfnt_off00011eff.bin
05ec3d9c82af49f351a04f20d994c356ccf5df35069aa7bf1a28232f9bd60136
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 11184 bytes
font_02_sfnt_off00013909.bin
96890b60ada4597254b80828e24ffc1591915d8a245c810c1f1d01564cda2299
pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 17664 bytes