Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b25b28979ec4ac…

MALICIOUS

PDF

92.0 KB Created: 2021-08-22 05:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9be79b016802f5a88325a50866e2b36 SHA-1: 3213e6dfe333faa1fbcb752fbe03ef57e17a64e1 SHA-256: 06b25b28979ec4aced1ec73edf58788419c1cf930a2cfac5846406cd4de72fd7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mjacz.cz/soubory/files/69183055694.pdf
    • http://ajisushionline.com/uploads/files/xajunubizakuvujoket.pdf
    • http://cc-loges.com/uploads/file/vorogido.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/fufccuensisgcmbuntn9vcisb5/wajazadakafuxu.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/a1g3mvcoapb4vefpg872lrvs5q/3927738077.pdf
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/72258491782.pdf
    • https://ginniglobal.com/uploads/file/golasikikixin.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/81164d56d5931b79ce0c9b644d9a7da8/bosowujob.pdf
    • http://auburn-properties.com/userfiles/files/pozenowewawopagirilavoxu.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2f29f714---18773831598.pdf
    • http://www.dean-cpa.com/files/adminpic/file/zunifumefirileruw.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6f94c235c---kemusogomefanisofi.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a692a29265c---derelap.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a79005d9b8---raboretekiwat.pdf
    • http://rowerowaszkola.pl/imgturysta/files/99531901099.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e93485c122bc31f9e994beb1c8a932b7/86017632585.pdf
    • https://arichaindia.com/userfiles/file/29078918794.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c0b282b6904b3f4339947049aff440ac/lirudefe.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/35718236772.pdf
    • http://vom-ragnaroek.de/uploads/file/31707077468.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+new+cartoon+movies+are+coming+out
    • 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_off000103c5.bin
942285cd30906ecb93017cafe5b8b2b9ade30df39fc295d3f4eb47c4391fbebf
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 16748 bytes
font_01_sfnt_off00012f53.bin
af9854c3a14960d6162c8333513b1c955a1ea0f7c3c1e2e41af7f53970c84945
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 10876 bytes
font_02_sfnt_off0001486b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1486B 16792 bytes