Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d89adb8cc0d490…

MALICIOUS

PDF

95.3 KB Created: 2021-07-05 18:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04e9a0df77e592c0d2d169891be73c48 SHA-1: 883ca94e46d42facb10001ae6d8136396621ceb1 SHA-256: 25d89adb8cc0d490f4c9d662705ec2736dec507d5f4903985ea649f9103c5e41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa115d928e---guparozatipikebajidol.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddfdaade2---togebebufa.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ca269d436---zixaketesonilit.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/92d7b1bd749af87d17aa94775d4cbac8/27513014001.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ca8332436cbfc35ed0cb323647dc99bb/zefulixe.pdf
    • https://repare-ton-smartphone.com/userfiles/file/75688912774.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083605a9336f---jufaru.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a31ed85124f---sakenedagifibabomaguselu.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2b7ff9e4bd0dc8bb2353393e37fe816d/boxirusomolu.pdf
    • http://planetamama.ru/files/file/40381449149.pdf
    • https://cpsguffanti.com/uploads/file/82902659398.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077f9ba61b4c---zuwafareg.pdf
    • http://alimentosldm.com/userfiles/file/90997584442.pdf
    • https://burgaseguros.com/userfiles/file/fuzexuriperujejopipeto.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf094effe---94322816265.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160792626370de---90928797834.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a8b36901e---talidat.pdf
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/8661549525.pdf
    • https://n-v-v.dk/userfiles/file/gejor.pdf
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/55c10a92791049e599092d281c60747d/vidipowumamubojujaki.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b0516d3e661---90038059438.pdf
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/gamajamubaguginuxivusavi.pdf
    • https://artlabjo.com/userfiles/file/63025114233.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de3a0c169a6---belarenad.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e80935222e1e5751922c4645bdb52749/jopufelidasarilu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=lord+of+the+rings+fellowship+stream
    • 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_off00010f29.bin
65d73468d11c2506cb10f29e0ba29dd5233343a3a84c8c7cf5b58d465c49b57f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 18220 bytes
font_01_sfnt_off00013e6e.bin
7835237cbae3218b8a3740ab6332e3c553696c176938b858aca4bdb325aa7d7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6E 10988 bytes
font_02_sfnt_off00015795.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15795 16792 bytes