Malicious PDF — malware analysis report

Static analysis result for SHA-256 841c598658769c0d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 04:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49add2993c4482a457448ea8e7a51725 SHA-1: be09d057eee3e3a1eb3aaec92262119e77e67242 SHA-256: 841c598658769c0d1c2ba28a60872096afb18392deb4c7b706c8b44db21f666c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=finnish+english+dictionary+pdf PDF link annotation
    • http://ferrocom-spb.ru/userfiles/files/90420326711.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/e3f445cb317097b249b35b08541788f9/80112538812.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/monelajuniwejab.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m50ohj8lk8ch1p2njpl0a5s656/53332713355.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/11816485114.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/pepolitufo.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/687f2535c757c702f55ecc3a629ed4ab/3773868101.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eda8707c12---toterosixiredulowide.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f2c49ddc---59148790067.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/94613626351.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/vazajeborawatimugigezof.pdfIn PDF document text
    • http://adveotec.com/img/file/rojexawadalekag.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c300acde873---vafawunituganaze.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/2650130567.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/12246496509.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b56e2885be---wokaduwegoj.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/34238357034.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xavufawenojarebigan.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609662fe678ab---37162098296.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/nuridukilawi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a2937ef64---guxasafuk.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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 10988 bytes
SHA-256: 31091290d99b4cde1c6ad78e7a258e2081c77f62efcde0f48f89087dc78f9267
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 18576 bytes
SHA-256: d9c868fe349a7a3e20ab90ea4ba59e5d9f66244449ed47aaed3743143289dda1
font_02_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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