Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d87d4f479b92d57…

MALICIOUS

PDF

89.9 KB Created: 2021-07-27 00:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6e62b3c21cce6cfa8af14ee19e1300a5 SHA-1: b398f9fa568762eff96db30c8a9528ad06b7c557 SHA-256: 7d87d4f479b92d571927c14cb3cf64c6d873c67bb155429cf268f6be974c4ae5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF document body was unreadable, but the presence of external URIs and the nature of the link farms strongly suggest the file's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/epahuvqfbuce4erj7vogpuomlp/73417192595.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b007983865---komupafutojomosodesojubu.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/kexupebapadikuzu.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/nibewusaragu.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/0shqf3tkco52v5dthnvcr0j62t/duxakejurufijapasori.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0e0f2fc32---mubozimeseja.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2e2c04b2c3d064270f2dc27a7390993a/15256699229.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa239be06f3---13313226414.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429110954915986.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b29fe552dcf---raxaneruwawagagivute.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/86595779342.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/95457652130.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/meliwidozi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c5ad1a00f---10768106482.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3075857d6---26566106429.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16099e17ac5973---70925598374.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/11653196808.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/54cc01c6aba8b890002ba08fca7bb8c1/riturijejigemabimigovepe.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/93995486260.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/97770517613.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210710131541_148627975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+trickle+charge+a+lawn+mower+batteryPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/7557302810.pdfIn PDF document text
    • 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_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 11172 bytes
SHA-256: bd5987f6aac182abca349d3373297379d21753628dccc00660f422bff7b9e349
font_01_sfnt_off000115e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFA 17016 bytes
SHA-256: e3b9834ee2b4699b9608e74f26fc5f41c6af69bbe19a1d267ad67b1a7cccab1f

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