Malicious PDF — malware analysis report

Static analysis result for SHA-256 d612838c5379faa4…

MALICIOUS

PDF

67.2 KB Created: 2021-09-26 04:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5426b2ae53df1abea7ff8eb42941ef31 SHA-1: 88709e751a87003ad2980ba04b47be7602ee18b0 SHA-256: d612838c5379faa40d80236fb6d9000e7e2e519a307313ccf77185bb439b2a07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://crewmak.ru/uplcv?utm_term=ultimate+general+civil+war+trainer PDF link annotation
    • http://oilspecchem.com/files/50631409162.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/33387970840.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/tojizatowex.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/97858703087.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/59719748672.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/75515354743.pdfIn PDF document text
    • http://olympusflights.com/files/files/jifufezagavevazipej.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/10465238711.pdfIn PDF document text
    • https://12shio4.com/contents/files/56184119519.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aac8cde77---12217064121.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137aed1735f2---95688194516.pdfIn PDF document text
    • http://labsshop.com/d/files/zazab.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2d66b0f52225c13052fd8970eae52a1e/1103084445.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/76768849968.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/55285639317.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/1047476531.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/40351462838.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/lowafap.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7fcd23d96d6773ce7ff4baf54fa79110/sukilukudonufar.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb48d1c181---76314542531.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/pamusuzanamipulowumol.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_off0000ab95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB95 14556 bytes
SHA-256: a0931f700aab0ef700bc1d7a2dbde0bb04e2c5589230d715f5bcdaab48b19a05
font_01_sfnt_off0000cfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 10444 bytes
SHA-256: bb39e9426bf2f9ef6ea00b89487a24f618893f2b87bcf876349c8a86a51dadbb
font_02_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1