Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc223344e2b39089…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 11:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 83276b7ff64f056c0051e1003e6d566e SHA-1: 5fdba16c25e97848da79dc41165817e6db107a70 SHA-256: cc223344e2b39089f4270194819d65acaa9b010bbe10660682e647b9e110869d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or SEO poisoning campaign. The presence of external URIs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gfzgt.ch/upload/file/38263377287.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088ff516211c---28838484349.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/98914767221.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e84c41604dfd65d384da7572b5782592/tegikusekozexujujoti.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/43088951722.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/45671395753.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c024ae5bb2b---98782109666.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/kasifitobukomamugolik.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210804170933_mzpzvg.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wolememe.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/56327383340.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a4f8b7964---92124871611.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e3dd43c1b---47648155522.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607011d8d987f---97939770804.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/julunudojote.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ho561ck8pirsk21ts5habdslq2/zewukaxidomubasil.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/20574736396.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/o93invcf8h5s51lrvvnplu5se2/volisalimipiluwewi.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/60187521967.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210830120223.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/d1jmuth4d7vlfrc3k38v2p8oma/87193037019.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/85606866059.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf785510a---mapewa.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ee61be695ed4457c43603d2887856447/rufaxekobog.pdfIn PDF document text
    • https://wmu24.ru/media/file/dobolidizotaxesopavugavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=logarithme+n%C3%A9p%C3%A9rien+terminale+es+exercices+corrig%C3%A9s+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 21092 bytes
SHA-256: cefed1df98962650781bcc952fd80063828373061a71a9a370db0bbe5ee084a7
font_02_sfnt_off00012d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3B 11280 bytes
SHA-256: 0a7573f872bab120e15681686aa16ae861a4997328b59a699185e7917a24c617

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