Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c666b91f4ef55e6…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 07:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5463899aae4baec9bfbc1c2a26643ec SHA-1: a01417c53f9104f4ac10b930e9db70e4ee3620fd SHA-256: 6c666b91f4ef55e6c1be07a536a3f15453df0592ff642a345337b4d3e49f5609
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs, several of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or phishing pages. The PDF's structure and the presence of multiple external links indicate a likely spearphishing attachment used to lure victims to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12082648932.pdf In PDF document text
    • http://laros.cz/UserFiles/file/52540337583.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/20143430545.pdfIn PDF document text
    • http://novichiha.ru/pic/file/jofifudapeso.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/wegumanupovadigad.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/kejufapebapatu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609303e0dc195---33889110997.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9f52a3d1---8498247340.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609196e758c3c---35479255412.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/63524015871.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/61493173394.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/wedawenewe.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sbnsh7dfofv4jg4l22p8sqh8k7/52217916396.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e5e64716---12354471387.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/43420285404.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/63786487972.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/pulurogo.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/solewuvono.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c435664c93---dofuwazemezexisedutafe.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/xodasenejis.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/63525374478.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/ruvejodawom.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e2c9fc44---2235418316.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/mujixularaforex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096577429c1e---5778121089.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/46133333298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=piecewise+function+examples+with+answersPDF 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_off0000bfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA2 14732 bytes
SHA-256: 43a3ed9d803ee01b763a28c228a7ddfcc9ca5087e259b975e5175bf81e25e49e
font_01_sfnt_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 11036 bytes
SHA-256: b2f4e97e6a86ede1697379b1f69da3dc7ec7ab0b04a55680e9aa235f48874fd0
font_02_sfnt_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1