Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8daf6adfcbd284…

MALICIOUS

PDF

84.8 KB Created: 2021-08-24 11:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1aa5fe4eed7632443f4384bc605a2b50 SHA-1: e25b5ed91c4f5dade80ad55234cd3bf056ffb3a1 SHA-256: 3f8daf6adfcbd28450ae0757c78fa38de63b21f83f11afde2f31e1b7e8f8c266
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This behavior is indicative of a link farm designed to redirect users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=how+many+calories+is+a+glass+of+prosecco PDF link annotation
    • http://accessiblevehicleservices.com/userfiles/file/44716755971.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f445988611bdbb53478776902f1f6c6b/97358444931.pdfIn PDF document text
    • http://easy-vent.nu/userfiles/file/pipubexiwan.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h0514kf3acg665an4dad3us5as/79479067154.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/36046665696.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/xifuwi.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/65113230919.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf052e0fa---99510891614.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d7d72776754dfc0c32adfe9f2864a2e0/rodixaxa.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/fininebidufa.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/53224631682.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844c15b629d---nabilujabuzibivizavowej.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/89850461374.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210609_093339.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/nokasazemezuguxem.pdfIn PDF document text
    • https://amblamy.ee/upload/file/posebuvidilijega.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4b8eaa893---23826218825.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/414ab9063892c064256cdeac2dbf50ee/jimibidawuzipoweguka.pdfIn PDF document text
    • https://questyme.com/userfiles/file/41313282248.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/kowob.pdfIn PDF document text
    • https://abeess.com/userfiles/file/kanunuvirexujozavopajexe.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ccce4378---48865108207.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094882c3000a---17989142206.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/balufivogazofu.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/mivenok.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_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 10916 bytes
SHA-256: b69c54b247b88b00a5aa93b12eec4b8a8d80d64ad8066cc938ea0cc521ce5188
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 17548 bytes
SHA-256: 169612627f3b9479f4fd04deeacf8bed405a1c1e02047d20cd68b567aa5aa6e5
font_02_sfnt_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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