Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8831db762c793e6…

MALICIOUS

PDF

88.6 KB Created: 2021-09-04 01:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5037f005070ef00abc57be13c941b24 SHA-1: 297d53b3d931a5842b5e3eace1da583cc9ed6986 SHA-256: c8831db762c793e6a2c847b4d6c73dabf39d0cbf71e9a73621e8670bdc86f2a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=converting+percent+to+decimal+worksheet+pdf PDF link annotation
    • http://agcslohian.com/userfiles/file/3367905621.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/7bec34c4ffc019d53746ddabbc1f4a9e/210734258.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/39752459112.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/zasixu.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/72486739385.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///wakonomakeredafovaf.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/11946399349.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/16227283220.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/tozobatazufimebugov.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3576c6f9953089742fc2cb99dd963460/49130511896.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d9f5ddbff---wibufuwufuxaxokuxovixopun.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/wutexixixisekinowal.pdfIn PDF document text
    • https://membermimpi.com/contents/files/80565628854.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/sekanazoloxilafakidutusuv.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/sodokanena.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gixuvobemiwubusulojexide.pdfIn PDF document text
    • http://benly-carson.com/product/files/lesatapazi.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/821f6fcd4c0180c852137c8b0c7dc0a4/bagesetobemurelu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3a779e4dfb7eb0a6dba0b8dd234aecdf/jumateb.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/56q1jrcns3hd9guq01bl6hah0o/73734311799.pdfIn PDF document text
    • https://ms02bet.com/contents//files/bojodilulolemakojupun.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/55344086404.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20216192151597839.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dusodipobukemozetedeku.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/44802413524.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 18020 bytes
SHA-256: e51300f19d1a7555473c04870c13d2b8517ef0375d8b7cb605cccc6f5842b919
font_02_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off000139a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A7 11344 bytes
SHA-256: bb4f4366a225adcf599da35a92ddf77a546de6aa3ac7011736f1ff1ce7e50021

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