Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5a52c108e29252…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 12:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8fc0a3b84de518f76cf0e197c9119584 SHA-1: 8cbed44c29fa293661275abe803799adaeec42c4 SHA-256: 3b5a52c108e292520c114d727d29dacd285bc6f98075eb3aa3dd9a719decba34
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nic-irq.com/userfiles/files/52462942642.pdf In PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/407e3ebdf28935c82607c134e54d09c4/55653358500.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/95002891342.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085739c7862a---44711107980.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4a32a6252---basifezofosakogeb.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aec333f54---87148714668.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bef58df491247381b5a1e0c4aece06dd/radipuginovezogaloj.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f37ed0e9d---45417342959.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/3si8tsdcvbc18nmdjknluubha1/51380156535.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a8c1d555575e0cdadbb7b61b029da288/26066721336.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/n0h1gda5og8juqob5q94fq94e0/vezoretemigod.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/rijuxabaf.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a9j44k2vsifq4heuju5l2edf65/disoditanaze.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/toip6jm5d4tltuboog3ebqbo42/dapemuweparesitifiw.pdfIn PDF document text
    • http://cocoal.com/uploads/file/71693972327.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072aaf5d8feb---zusujawotagelimerozora.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/modubawopibosibure.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe3ced20d5---farozenepugonafipokuga.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/49b4b5c0a583c3174f0c460ef48d7164/80697035302.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a27ae11e6d---4561124919.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609873f7c2215---14692436571.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3440037566b4df10160f19b928ea6a45/ribumitavikof.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/fbbdd5dd4914d3774c1669577a01d101/rimokunikidolimofepig.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/sirapemizuxuvixet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cleaning+a+paint+brush+with+mineral+spiritsPDF link annotation
    • 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_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 16776 bytes
SHA-256: acf53e14b39e608bab768419798f37235d1d119ffc7b03d3e983df2f99f51dd6
font_02_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 10936 bytes
SHA-256: 508489c401daaba59f58927decbab6215d0b3e1adb41452ce260ffd79cf01e69

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