Malicious PDF — malware analysis report

Static analysis result for SHA-256 e731e12a5a8ea0a8…

MALICIOUS

PDF

87.5 KB Created: 2021-07-10 14:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3a08e525bbd5c2c67f776d88598e261f SHA-1: 6951806f517f4dd790268a9b564b2b775eab955a SHA-256: e731e12a5a8ea0a8e09ca542f311d4b24a6b108aac794b95ac42ad549535e396
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/42lim4esnvi02pt46tqun6521b/75329030228.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/065e3d8613610a55a25e1da1c272346a/neruk.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/62706051563.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9cc7895034257d9721266e0c594a4339/motelafikobare.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/nipuwelepumekomifudotad.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/berenivegosagiwum.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46c2f8fc78---7981336816.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/tozezomiteferogapadiru.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b956f2c2f57---37420898877.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/mufuxinuxisorig.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/zajinizowekeretofa.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/pumobajasevanonisusilalep.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2ksavoein9muhg2p0icv57v1u7/bavizubu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a21624f0a---mabijowugudabodizopiso.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/bamojupovutimepojama.pdfIn PDF document text
    • https://domilot.com/uploader/files/favekakiraburane.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/86438374672.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/bidiralivimimogabigamek.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/9271721389.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096d3d19a118---75826418113.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/losatiturokari.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/51360954004.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/k5nupcm7s164avifdhitump5c6/95510380430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=7+day+forecast+zion+national+parkPDF 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_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 16904 bytes
SHA-256: 51c58c6c9cb3341069e20c8e4cb457f1f88a45adc351579804542480d78317ff
font_01_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13635 10832 bytes
SHA-256: 39905310dbb91adbf85e100ebe381f8802cfd1fa22d9e1feecbe1ede9d4a4fdb