Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6cb53984bbbb65…

MALICIOUS

PDF

91.0 KB Created: 2021-07-25 01:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 448f0b147bc52d7c9021f1cd2ddcc0f8 SHA-1: be6e6b78c4f1cd596bd9c88d4fc7bf10d34588f5 SHA-256: 9b6cb53984bbbb656172e6b3c439769b5a6566ba69b7ce5f0e5d6eb8d4d3ff7c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various websites, many of which appear to be compromised CMS installations. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of multiple external links and the ClamAV detection suggest a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://examonline.org/examonline/userfiles/file/93758195008.pdf
    • https://opsclown.it/ckfinder/userfiles/files/zuwejenavut.pdf
    • http://banghaija.com/userfiles/file/70678885836.pdf
    • https://o2opr.co/userfiles/files/71939402013.pdf
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/loxudizoseninabimuzum.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c5b43158---16400535478.pdf
    • https://hoakhanh.vn/uploads/image/files/20554251609.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5278dd2d62---wesajageruxodozafiwowi.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/n11h6erij536qtttvuarb6ifu7/kuwezogixajad.pdf
    • http://pettwayfamilyreunion.com/clients/39389/File/wamalorikoretopof.pdf
    • http://asckhn.com/acskhn/userfiles/file/96057387378.pdf
    • http://clearspace-design.com/CKEdit/upload/files/laxajosa.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac43284cf1d---53484728939.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/88598285461.pdf
    • http://cheers-gifts.com/userfiles/kijasokezibulupezosagexod.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e036fbc318b---90363724191.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/s130ut7dc87l774mvh7o0j02j7/sufozokuvot.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/upagtafbdbhl6nhulk49jvovl3/56786300163.pdf
    • http://au-zlato.sk/upload/files/24593339567.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd3545e972---5318290490.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/60feff2c2a120ceaa21de0dc72ebb4f6/xekofopoxanevikofudalub.pdf
    • https://producedepot.us/userfiles/files/33234090868.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=code+triche+pok%C3%A9mon+noir+2+%C3%A9mulateur
    • 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_off0000f556.bin
7789c0eb155f8e58c9b4c3ac609b18c6867c708e90079c4cce9fd0538155c451
pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 20320 bytes
font_01_sfnt_off00012973.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 16792 bytes
font_02_sfnt_off0001418a.bin
2a1f0e88ca5e8b805d0d7501acf9c4051e231cba058bbd2559807d2e6958e0fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1418A 11108 bytes