Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a22611f973b93bd…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 03:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 13c5f37dfa5957bd9e4cafc248ecce1a SHA-1: 08d3f18eccd82cabfab02408e44bfde2fb68d2f0 SHA-256: 5a22611f973b93bd73219d816ef4f18d30477fdc5dc13c0497bcab7411836b80
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve as lures to download further malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/fej8dlaa756si6lari5nnr8ub1/41503288311.pdf In PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/pafilufale.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/vasikomamiselapebewojom.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/utmma7gp1efua44etr2hnogeqe/25245984986.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d472523b89---rezegopuvuma.pdfIn PDF document text
    • https://beaszemin.com/files/83871753056.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f3462db76e08fc3ff9781a10de94c618/sifolofomoniri.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/badf2ed58072a42ac444d4c5ebba7f57/80606977960.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f16f6647ed---vizadol.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/27909642271.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/1cegp3q9mao5ti0ji74kfrjs25/bowutulapinukuj.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/lurikok.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2184f6c345d1cbab22ad175410e4a2bf/terolagosozed.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/fodebabikuku.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/zodujeler.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b33cfbc722---wanunanakulumuregera.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf559ec633e---60266189216.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/0i8348821rcenvi0h0vvn2t40m/18075738714.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c09b2404c---86435418206.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979ea6ab996---87606340255.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/75182744376.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/68607970966.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608932ed515fb---6458200764.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2urolvdi1t08be0p6r92fvi7ch/19446392290.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/fitalorenulof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pipe+fabricators+blue+book+free+downloadPDF 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_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 11032 bytes
SHA-256: 5021c417993d9ccdb2e9ede3ab00fa25596bc09c2f3f4380990e726fb7b8aee8
font_01_sfnt_off000112c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 17528 bytes
SHA-256: 347703c4be7151e072ec1a117c30dea8f97aad8c91a407bf095eeaf73a50c1df