Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1352973967208e…

MALICIOUS

PDF

84.4 KB Created: 2021-07-27 11:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 260cfcaa6c74eaff8a574202c2e5d94e SHA-1: 9a20cd10d9ff3e8d82bc2549df6ebd8b0164484f SHA-256: 7a1352973967208ebe79963fca025a55380a7053b19d07a912fffab7759a644f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URLs are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4b32f20b---xopowim.pdf In PDF document text
    • http://qtjdb.com/UploadFile/2021/06/22/file/20210622_182022_174.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b48893f81---49953574187.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/zebupila.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/78906011615.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/56984453148.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/0tuiq0c568mdqtuji1f8755r8c/wolidixujubedaj.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a40b7e1628a2cccaf491d2a47e2e03e/puvavugokisivagone.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/gakifenivowilewojafu.pdfIn PDF document text
    • https://dm288.com/slicice/file/fevil.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e1af53e61---fisavijubagubofu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/in6ns2m3fdqvje7c13lffsik5a/bivenuwujoli.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f07e482ac7f---21128724016.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sq7ngh7ig91a21fm4hhah2mfl5/64974620110.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f6f966fa0d83b3ba6589baddde444aa5/40964222454.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/86789021925.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3a1c1ef42fad9cc4ea760fec2e5851eb/nidafikuwixo.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725e5343490---71522644538.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/ninaxikadiwa.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f53f29bc9f---31651211100.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/nuzad.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/viwoxelupekuzuriripega.pdfIn PDF document text
    • http://hanleyresources.com/images/zesogudexiv.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/romelerinozozixumaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=maytag+bravos+quiet+series+300+f01+error+codePDF 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_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 16488 bytes
SHA-256: a8da31509d7f300d404c6d042fadf550514e54b64db828f4c907775820be0425
font_02_sfnt_off0001282c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282C 11408 bytes
SHA-256: 48339a5c4c30c5fb71884ffa4ca9d1402fce90d22107c90b012a49754769a606

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