Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e157f1c5a9746d2…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 19:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fe7a24365fac59e93d8cb85a3f0e3eb SHA-1: 5c50c65011106aefe099c7bd2f971c551c97baa4 SHA-256: 7e157f1c5a9746d2c7ba565589e734b5e57b3fc086f04dd6990de577dff11274
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the heuristic firings and URL patterns are highly indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=jason+derulo+wiggle+download PDF link annotation
    • https://callmarkinvestments.fortunekenya.com/callmark/files/xoxudidoxeponuvuvumenofil.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/joxogemosi.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/taritoxedozomuzuxujasop.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/54492706518.pdfIn PDF document text
    • http://itena.si/uporabnik/file/gotorikofavi.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/zolevebuwetekonixuxanuz.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///pepewipazakefuveg.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/suxevakisugunuziminabes.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/56055941161.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/tizotepalokivirafebimozal.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/wodijuxal.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/29958296799.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/komaju.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ds557cpp66duncdvf7t2qlnok7/75689231199.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/72a166620e82a679f3d481e4e02ff96d/wipiruvuzevego.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/roxurudivoxifudakuso.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9e9ee7a6---36118200556.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7550218c3---wuvalapelodijanilinenex.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/pomeradotabixizinokudep.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/98919275991.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143f5b3c1047---36641965677.pdfIn PDF document text
    • http://agrion.org/upload/fichier/kimegikexogerojeximi.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/62765398676.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_off0000c246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 10500 bytes
SHA-256: dd312424618df695314fe510e0ed186cce883dec0de6263914c0c5717be04ce3
font_02_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 19920 bytes
SHA-256: 22fd11d1b440299b2c5821a9779b5c04930126207b0b29c8eedb0f36343f0d5c

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