Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4179e58b2a3e7f…

MALICIOUS

PDF

104.3 KB Created: 2021-07-04 01:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0f1c327005065fd2942ce8da4bec933 SHA-1: 80374eeca9c23d82d19581573b500d6b29efe374 SHA-256: 6d4179e58b2a3e7f07a55393a679ad03d2c4c9afedb51146837abe5d892da32c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. These URLs likely serve as redirects to phishing sites or malware downloaders, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://longarmquiltacademy.net/fckeditor/userfiles/file/duvipo.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5c3e317fd99fca97a201b4c71dd88b75/11182731122.pdf
    • http://gwtcs.org/Content/uploads/files/xesajanamesijudopuxemo.pdf
    • https://samudra99.com/contents//files/pipifimi.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8eea92d6---dujufemod.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bbdc49f73a726adcf2b3d5e35b1dcffe/dapapuxugipiv.pdf
    • http://akinmedikal.com/uploads/file/42823815456.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f3d0622a83c8504cd595b9f5949dab16/8080380740.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082d232b2d5a---giguw.pdf
    • http://akkoryazilim.com/userfiles/file/88513490092.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1e35c87bb---83083421209.pdf
    • https://daiichigroup.net/uploads/news_file/dexinaxonukenobezusimepi.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807cc5883c6---revaxibazegupuvolefubu.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b49ac4d6fe391d11f18876053964276f/93959261624.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071df1a2e5d2---xesumebatavos.pdf
    • http://biosite.ru/images/news/file/6099232397.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e673ca7b4f---dakimolom.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1176e54a4---66677209126.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/onk7g8uejoupp6519sd5aeqem1/bedajevenemomefelidod.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6598efb89d2e86348de7315b485bc1c0/1101266364.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=write+a+balanced+chemical+equation+for+the+standard+formation+reaction+of+liquid+ethanol
    • 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_off0001295a.bin
5b2dddbb3c2efaab6a6832c925d754e4fc2e011c9ac15a192ed7cc73b06f4415
pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 20152 bytes
font_01_sfnt_off00015f44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F44 16792 bytes
font_02_sfnt_off0001775b.bin
d44be428a14886c242b90e40ab61024bc38381036245b2b56c9d5fe3c351424e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1775B 11120 bytes