Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a5fb101174386f…

MALICIOUS

PDF

85.6 KB Created: 2021-08-30 06:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 816f688b278ae4163d9353da8e8d35ad SHA-1: a25c82439b9d519f966ff51dfb895dfd5d42b541 SHA-256: 43a5fb101174386f321f5f29b38622782ff00470befa8fe0b553b7afab1bacde
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/uplcv?utm_term=prove+that+vertically+opposite+angles+are+equal PDF link annotation
    • http://dalnoboy.net/data/filestorage/upload/files/26853256604.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/90g7e7cdk4mf9qr91mjqgdua0v/kiravorapilumimusel.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2014cd8a176483f3abd3be27e0e226e6/66313167676.pdfIn PDF document text
    • http://cke.hk/userfiles/77748432179.pdfIn PDF document text
    • http://brlairport.com/images/file/kuvogejokopavonagon.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3cb6ec44c307671c02cc6396a60727e4/ridapokaxa.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/xabulenazudazi.pdfIn PDF document text
    • http://hodori247.com/uploads/files/minododivigawagewupak.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/sudutunidavaxokavemudi.pdfIn PDF document text
    • http://allasclub.com/campannas/file/64346634234.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c604f38d---ralejodazisuginasifijuger.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a278ca9099---wutapitevikutuzujame.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/naludutivafebafededekup.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/lezosadogexoxofalifage.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/fugesojamasisojimagetimu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df8b777cb1dff10e67d5ea75220c8061/9001904803.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3c8b4fda98fa7c2329cb259b529f2210/94276623942.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/13607344137.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/25408408824.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/jofirobugazaxe.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084810f6e670---44024881250.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m99mii9gfr40vjqmneo2hjudk5/jowetuserazaza.pdfIn PDF document text
    • https://htchninc.com/d/files/govepetoxu.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/92324630392.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_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 19600 bytes
SHA-256: 2bc6cb5ba580f8effb6032df3e727e2d9d30473005b1bc07e203ebb03308b0d6
font_01_sfnt_off00011629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11629 11080 bytes
SHA-256: 509a1139917f6053a04965bc9825533af05eafddfcfc0bb2d452ec2b8f35f562
font_02_sfnt_off00012fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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