Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1352d373c340f43…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 01:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82c5ccb00fbe93f539f53382ba612ec9 SHA-1: fe0a9ae297316437cdb9b1df93ddaaaa36c87eca SHA-256: f1352d373c340f4339cccc365df460ce5e5ed9e0f965ba8216e650d270f0aef5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://allytemp.ru/uplcv?utm_term=seasonal+jobs+that+pay+well
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/rosuxosokogawepojagavew.pdf
    • http://kyanite.tv/userfiles/file/pazanepizogidupumup.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba1c69c42---45144678881.pdf
    • https://zoldlepes.hu/userfiles/file/sinesubuvekikalomisojad.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2fa45216b---sinezufawibekivixubiriw.pdf
    • https://gites-les-bardots.com/userfiles/file/88413994149.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7666801c83---reduzetit.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/p4jurpl2m98ujn91pg1oria6b1/51053472325.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2ea341cd150b82b244c7b6fdd28347e3/40519275407.pdf
    • http://kadh.kr/bobod/upload/file/99994634072.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c410dd11ba9---jemuzorolokaxijutogipab.pdf
    • http://werkkledingverkoop.nl/images/docman/files/30708068244.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607555d2dec19---filawiti.pdf
    • https://performanshost.com/calisma2/files/uploads/buvilaresexupizugexuw.pdf
    • http://mesterek.net/tmp/57867780730.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160907d0949bc3---pizojinu.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/42606937587.pdf
    • http://runo34.ru/attachments/file/wabepimalaselimuwukepoji.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/89ef3ec0f7eaf84a83078fde74d727e2/12177617418.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b771c57761a6192c853d44a47c3f94e4/9383089957.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160982bf71be10---42452802064.pdf
    • https://alternativecarrepair.com/userfiles/file/fukebokukozeja.pdf
    • 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_off0000ebfa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 16792 bytes
font_01_sfnt_off0001040c.bin
904036db0854c14b60017f205694a094af768ad06a09d733f22857a28a112371
pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 16904 bytes
font_02_sfnt_off00012ff0.bin
38ce935921fcf8b831396bfe8fe54236e73b12ee689379c4f5374689b43363ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 10704 bytes