Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d868b7dc83b8230…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 07:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13066ad55d652d37125b3db74fb515ad SHA-1: 1b5675bd2105e797da2233785602b14f64cb44a4 SHA-256: 8d868b7dc83b82302fce4d14a456822e077af07ba00856c0e8cec18fdfbf44c1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links to external sites, many of which are hosted on compromised CMS platforms. 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 scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://spamsmsgiare.com/media/ftp/file/valenesafamomadunikulule.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8bc6b537b---19958660068.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/2145863780.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/67efa28835242ab9ee91db93d558eb7c/90985064922.pdf
    • https://idd.no/ckfinder/userfiles/files/52185326547.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb0f22cdb---nilajoteziva.pdf
    • https://soudurelauziere.com/upload/editor/file/bizopam.pdf
    • https://bestcaps99.com/ckfinder/userfiles/files/labizivoveso.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/tetanilevo.pdf
    • http://headrepublic.pl/images/files/30080482120.pdf
    • http://onnetsolution.in/userfiles/file/4493484700.pdf
    • https://binarbaid.com/public_html/userfiles/file/fobagaxutusuti.pdf
    • http://hotspot-usa.com/js/upload/files/2323364563.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/22d566ed3dc6fc65c69f6946dd58818a/51576260895.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf42564a01c---30074962419.pdf
    • https://thefertilizergranulators.com/d/files/96443604209.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/bubitose.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ubpfuea6mk4vmoa9r73u8rlbqg/45200871192.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4bc193f9---pusoziverivuzipetilef.pdf
    • http://aapltd.net/userfiles/file/35495986260.pdf
    • http://orderkiwicafe.com/uploads/files/zomazujojomep.pdf
    • https://tipresentoio.it/images/file/84000005962.pdf
    • http://fittbike.hu/files/file/74058984864.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0e2e4b2e3ababccbc4f6306384f2b20d/9743622493.pdf
    • https://ytdrive.com/CKEdit/upload/files/30248272449.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=jeep+grand+cherokee+2016+user+manual
    • 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_off0000dcbd.bin
6989b9d163b3ea03a77230a25defc2722bbd946433aeb4c9e51d95992d5345f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 17048 bytes
font_01_sfnt_off00010913.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 16792 bytes
font_02_sfnt_off0001212a.bin
7636041fe6e4d27bfd12c09f842737242f7f9cd9ed0df5d5c86c947120cfaae1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 11416 bytes