Malicious PDF — malware analysis report

Static analysis result for SHA-256 81317040a9e23c94…

MALICIOUS

PDF

76.5 KB Created: 2021-08-26 17:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c9f70e5daa81136d31d01bb69ac25dbe SHA-1: 4d0194f0decad7a1f5d0c4901235c873a82b0837 SHA-256: 81317040a9e23c946466745f2d9c4db7a7c845f08890c9e66dceca1c7cc8e3f2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://shinies.ru/img/lib/file/22039898517.pdf In PDF document text
    • http://radissonhoteltraining.com/userfiles/file/98953514222.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813d869054c---dezikegeb.pdfIn PDF document text
    • http://quetthe.com/upload/files/jedidadisonisenaku.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/wavojiwidotilovefemuvap.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1481b5838---varixapisozizo.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/jarazijuz.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9325d156a7a41e5cb7c00f2604bf4fa0/92319735896.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/bupepudizokapaxevate.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9ed91bda---20033950780.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/55746677027.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/5088194180.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f5be575d---25322815898.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/93c8a5cf6298a9762435fba094e0747e/xasitadadinadubir.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/tutarofimine.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1f414522---movibawuxusimudubipoj.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/tilinijekopitagiminoxiw.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074815b2e910---70934785339.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cbcb8a5b18e0fb305c5b004790dc971b/53462403747.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/npo1pd38c6ktfqco0l6hki62e0/32676984261.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210611_000F788B0A6357F5.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/23742274750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hibbeler+mechanics+of+materials+10th+edition+solutionsPDF 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_off0000c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 11144 bytes
SHA-256: 5072185e5d87a994771868b9b2425720896cf3d29253f63874634731fc22b9b4
font_01_sfnt_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 16524 bytes
SHA-256: bb0ce72c1cfcad3aabc8580e49228b5a6e6b9a876c883b087069def2060c04ec

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