Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d3df18289dd804…

MALICIOUS

PDF

89.2 KB Created: 2021-06-29 10:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 819b38a83e3cbc25163538ad85935992 SHA-1: 2cf7643b5df93755e7efc3362fe19bc7a8a7f97c SHA-256: 90d3df18289dd80452bb13bc74acc7e4e3ea77011ef3f8de817bf35406287abb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8683945b---35505241559.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/josasijoverosojiwo.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6037bcd7---nonuvitajo.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfed581203---80194576041.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/175ec66c1514e2c9126d0d946e9b7b53/wowok.pdf
    • http://bet-balance.com/userfiles/file/19006662888.pdf
    • https://aashianarealty.com/file/lavifasoxibire.pdf
    • http://diversecityuk.com/userfiles/file/54632593743.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be6f5c381fc---wutugiwirexazovibofi.pdf
    • http://biomassasia.net/data_ed/userfiles/file/99829449866.pdf
    • https://dianthusindustrial.com/resimler/files/widixefejupiwune.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cba6db97a5e243d98a5757e2c68e73ce/gebiwetururuxigimiwumuv.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098a76c6a353---9513844636.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbfa36a3ee---tefolunovukowa.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c6d6682f94ddb3d4f5eb8fc4a4f26d1e/54150153277.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4c9eeaf043809e568bd45fb6da254126/54880405193.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6a219c7cf---58806731778.pdf
    • http://yuhenganquan.com/userfiles/file/20210531194922_500549631.pdf
    • http://kopdesign.nl/userfiles/file/68895111129.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b020569ee---17902722906.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/gorobasuwujajej.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb0132419e6f5e227c448fae6d9249de/jepun.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16074af612055f---32363190352.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=reading+a+chronicle+of+timekeeping+answers
    • 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_off0000e984.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16792 bytes
font_01_sfnt_off00010196.bin
ae918c2d0ebe7a8c8a8e14d6dee44ae00d0949b00c9aa228f6f7b7a981a67df5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 29312 bytes
font_02_sfnt_off00013b4f.bin
e38c157b3afc1b8b108cb5bcacb9768fce56e31fd07d8b88ec5ef7d4c34cbe0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4F 11288 bytes