Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41577e4f52d13c2…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 12:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8961838144cea48e4890332a683108d8 SHA-1: 0bd505353aeb49479ab660f6412955ca09b48582 SHA-256: b41577e4f52d13c2cb08c0f7b82e19d04c92dd1b808df5f9cf6e80afcb3c1ee4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=indiana+high+school+track+and+field+records PDF link annotation
    • http://luingpyrex.cz/foto/Image/file/89120039122.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/7947183693.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/leparazabiguduzewuze.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a9c7c3576---povovifotakisu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc62533a19---68220547727.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79a15d68c4f9bf45e20500454112f332/xivemalelesivibana.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/nelani.pdfIn PDF document text
    • http://k1a.ru/images/files/file/kesurebirumiken.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fee49e92c6---44326648208.pdfIn PDF document text
    • https://mcrlclient.com/ckfinder/userfiles/files/zovuseduxu.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/sifopedufupa.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/df7f7d4a1f7660c819a2e57c49d03f3e/32989060708.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/66699711027.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5984e8144---bowipiboxudeboforijimufa.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/zatijepebanimekivete.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607722d85a2e4---26672941525.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/madipopepivokudek.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/naponatinuxoxuripusi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c28b0e7d---47603993504.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b99abf18e7bbbad039b63bdb1e306f2e/laxununojudopejidakugasaz.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/sasufifojore.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4d8bbac67---gunelozilemivakesese.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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 16532 bytes
SHA-256: eb09fe56b7d761e00f834f4062350319c126f6b7439660decc7a17df97acd73d
font_01_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9D 10800 bytes
SHA-256: a187b8c5371bfaf597a6a8dc54eeb8206c5feea47a2603f2933142ee39123d44

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