Malicious PDF — malware analysis report

Static analysis result for SHA-256 17589278db2d8bc7…

MALICIOUS

PDF

96.4 KB Created: 2021-09-01 05:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 269466981a39d45c5dc4b9f591b1eac5 SHA-1: 5cffd1e92155aa7fd4539c8c9fc42742506ed9c3 SHA-256: 17589278db2d8bc7619c99b907bac2f211976db0273f8f58a9985184c5a2a08a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains no readable text, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://rozgarnetwork.com/ckfinder/userfiles/files/pemuwuzavazijo.pdf In PDF document text
    • http://china-miyaco.com/img/file/2021715214843.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/movovisiva.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/37119182363.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/rotami.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/j7oelittfbn5jv2qtf4jokbcue/44060771773.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7b6hevudf9jhj1pvrkh4221it6/walanuvanexolerilobunid.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa32d588f38---gasajoferuwogewozozuw.pdfIn PDF document text
    • http://greenld.com/userfiles/zezawibuxisujusafejawono.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e73251d1---gekutape.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e254972da---kelerixobesekel.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69d051cb1---72061689571.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ubc3sfbctcmh7uhafhvfnoheq3/bavudipijadawisanul.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/rurunevameni.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/tojewegezimogafizufuj.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085383e0d189---gipupisazifotuxizuxagek.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/navunovupurabijekujav.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520200313387420.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/odmsvsm2q9l2100uiqam1s2vro/23917461091.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610d6a989e730---kevafipegajaburedok.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/jiselinikufuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=heart+touching+love+good+morning+messages+for+herPDF 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_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 18676 bytes
SHA-256: 4edd6e451bb1fd27d696d430c3486ebcffdd4912de1183c0fcc2c8ac159e1688
font_02_sfnt_off0001597c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1597C 11080 bytes
SHA-256: 8fd61645b0cb6b37e5087295fb3a3c700ba25230dd3730ec69faa1edf32e9f92

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