Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf6118b4da0d20d…

MALICIOUS

PDF

87.2 KB Created: 2021-07-28 00:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef4e38181ac4e1531aad4901b9b5b596 SHA-1: 9870fad05ec8ff05c8dff0f54ec100fc508acb52 SHA-256: cbf6118b4da0d20d8ef722d706bcbb308a8187e66760636cd3deb3ab7bf47003
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS upload storage, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The presence of a link farm suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609207d65f603---kuvitexogisoruwosukesowa.pdf
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/nesavavurorit.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1d5b755e0---lomuf.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607214251e06c---wulin.pdf
    • http://thedewakohchang.com/image/upload/File/adovuxu.pdf
    • http://cozycornerexpress.com/uploads/files/75141804506.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dd7227258---jivunafizip.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160929c0caaca5---goximokitazirelufazujer.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9e69ce73ce43b202b3a18f45113ca37a/25232701655.pdf
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/18393514037.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ee1607589---75211278888.pdf
    • http://bannermaul.com/userData/board/file/44986036652.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32f3bc137---80996486759.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/kudiru.pdf
    • http://thessalonikiflights.com/files/files/91496235638.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cf524a176f6f602e81e6026368c350c2/71110293616.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc9df9e710---17627804507.pdf
    • http://psychoterapia-przemysl.net/img/userfiles/file/fajasalimonukipupisasi.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/gjop6r798rp7f6u69s1ea7fed2/misuxiwuvodobobit.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/binojoliwesisesenew.pdf
    • https://arhometutor.com/userfiles/file/6404151912.pdf
    • http://alemotta.com/resources/original/file/22225209384.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c78ad3ee2---85061648986.pdf
    • https://begili.com/uploads/image/files/9387900702.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=top+islamic+urdu+books+pdf+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4fc.bin
56d8218417edce8579ac1ce663f62575e251a6a2004ab0925c87efd0b1407e88
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 10932 bytes
font_01_sfnt_off0000ee1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 16792 bytes
font_02_sfnt_off0001062e.bin
1778f202183156c98856c946deeeb9318b8b70d75b2d085dbf0b677de7193946
pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 18776 bytes
font_03_sfnt_off00012421.bin
7c7a1e8a79246f9ce05a0f1b972585c0e43015a99cb078940a694c63e86039a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 16360 bytes