Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f37ecbe6c308c2…

MALICIOUS

PDF

96.1 KB Created: 2021-07-04 13:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 818dbffd56ab7b04c02313e57acd2583 SHA-1: ce5a3d115592d15679632bacb6623401d7c73261 SHA-256: 58f37ecbe6c308c26fe9d698c85a739877a98f712ac9ff0f6a7b8d9b43bebc32
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://kaies.cn/upfiles/file/pepuragobijigamufatixe.pdf In PDF document text
    • http://hotelhoanggiaminhchauquanlan.com/img-kskc/files/34223767185.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/61262872375.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2a059694512ead7190d040864a540d61/mopujirezebetafew.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wepufewivisosoguwiwuki.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/8fff41a79ef9933b4732235b21b5a7ee/18853978301.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/furipu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/53938254720.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/54794312041.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4d1f34c8fbdf8280722088f8c88ac3a8/89984975469.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/rolebi.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/dowisulamakodix.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606c976186dec---luwonigonunemap.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/66158208793.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16076309cb7a5e---falurenalajekateromaf.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085a21561896---10559401835.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d544b26c2c2228d89026190db5c960e5/wugexin.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/nogirelikejidipesuregisaf.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/nalapemoboranolefaramanov.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8ccc0d43f---23466861601.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/worexizupabek.pdfIn PDF document text
    • http://www.heksan.com.pl/file/movon.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/80126115795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=research+topics+in+computer+science+2020PDF 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_off00011195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 17572 bytes
SHA-256: 87492aa62599cb5e2f813d673c49a98bdac0e10d144d631214e5bb642b649f94
font_02_sfnt_off000157e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E2 10980 bytes
SHA-256: 147df5b9fe3a6e2ef19e05537205f97b7ab0875f436ef61894559bad4ed995ef

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