Malicious PDF — malware analysis report

Static analysis result for SHA-256 979fd9192d6376ca…

MALICIOUS

PDF

82.0 KB Created: 2021-07-09 09:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93ff2a6e6c310ca3f2bcc8f822924ecc SHA-1: abf3de29293facdcd6f750379c6bacc73bfa9987 SHA-256: 979fd9192d6376ca75a9fcef57f7ee7342addb921d4eaa1ec531828e0fd3bd54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086afc04ebe3---jovagafejiz.pdf
    • http://orchid-daikanyama.com/userfiles/file/xuxazonanijabekumosomo.pdf
    • https://oteaexpert.fr/cite_imgs/file/jitelefu.pdf
    • https://cabsfromheathrow.com/userfiles/file/2835860485.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc58180df7---93930557854.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a7c527d3d9ccb53ae1c054f58ddd4ade/95659992241.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a16269cb5---94241708716.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935e6108b3f---31778409993.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99b907ce5---42218395212.pdf
    • http://contactconfiance.com/files/files/57692581709.pdf
    • https://aquafilling.com/userfiles/file/25386032321.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f00c41aa1---16036449989.pdf
    • http://xlpe.net/Images_upload/files/rawiga.pdf
    • http://greenbrier101.com/userimages/5684333028.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f391eea5bf---kizajononozawigu.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721fae7a4c5---sanipu.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87472e4e1c---kamuvomezanubolajomaduw.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d793ae0cebf62b79a81d0ece67b945ec/59599173698.pdf
    • http://woods-china.cn/ci2/userfiles/files/20210613143319.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bc629a69057---semamivirogejoxoxug.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/673a49d8341a13be2697c8fce9b70dd0/26374864372.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dc3c72686---rurom.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a4478060---zederejamiz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=map+skills+worksheets+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_off0000dee8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 16792 bytes
font_01_sfnt_off0000f6fa.bin
42f70a61ac30c0123a61ddc8124cdcd48f5fc5f35769caaad3d20777e4aa3ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 16820 bytes
font_02_sfnt_off000122d1.bin
e9e7221945b03d58bb049a080c167224e60f3d3cea34e0eb1e2e429e67174afe
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 10520 bytes