Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f1d2cb98e3dc43…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 19:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b736346904bdf2cafbcfddf58e323c21 SHA-1: c325a2eaacd819e96bcc99faa470e91349d3415d SHA-256: 25f1d2cb98e3dc43fb4d810edfa945e27b6d75baf532c87d7a4316764f244987
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=network+signal+speed+booster+apk+free+download', likely serve to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=network+signal+speed+booster+apk+free+download PDF link annotation
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614763cd41c7d---deloxalonogilanolom.pdfIn PDF document text
    • http://sunway.me/uploads/file/172350006502.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/73877000520.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16143a065e874c---78093494810.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/buzefamutidigilolu.pdfIn PDF document text
    • http://mamitobe.ru/files/file/rinaxifefifomigalogopu.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/vekerekinuvamodazob.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/daponolikebapexa.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/silusivesoxopaligawekur.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/59686279368.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425d6443021---38798227920.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/xobumulipupokuvesota.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/vexapowewilidekifujeveg.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312bebe6b84---xuwiretazerejubinox.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/65798007943.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2a6c2b20---zuxinigugadanositagomika.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/kolumijobimexebon.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/61088511380.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210919_4F44EAAE2D57DC87.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/dopaxupop.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/loniroge.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/47621725274.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_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 10968 bytes
SHA-256: a12aa10c3a899754bbfa939f3dfa2c2e086fc48c258d073bcbc0b54d07a869ff
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 17524 bytes
SHA-256: ee23b344bb02f6537759e2341ccc3d232e0b179a7526e830ecab752e02d2da2f

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