Malicious PDF — malware analysis report

Static analysis result for SHA-256 2060635bd92b76d3…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 01:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 595fb1bf4d39d99fdb9338236f7e6e37 SHA-1: c0e2ef98de18e063fb7067c45831a288ff0233f9 SHA-256: 2060635bd92b76d3882ba8f8802803a08a18dcef310226a0415e4f60ee38c1d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b82a8b3f7ffda5cb1fe55794ccd7eed4/97678392639.pdf In PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086fbee8dd2c---jozudupegujesizemonumaze.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/97804678301.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/e70ivt08g8qvuj3fu7h3hjb1pj/92582566896.pdfIn PDF document text
    • http://aweibel.com/Photo/file/22739286324.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a0542f3c98a---vodipipeti.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/mapoxemube.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/0mag18jp41sgn4slhmarhoa0rq/wotum.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ac18b36c6d6ba4c1f654e617b811c148/89624683817.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/nutogorawu.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c977860ce60fa77d3edaf6c638f403a3/39170450492.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/227610epp0nkdjp5m46j22us0v/bedijanaposotakutuwaxu.pdfIn PDF document text
    • http://receptlap.hu/files/zokigagogisexebepotumazi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/810fadef5e148cfb7e267ac348e0dfa5/ninesasuvufadetatimupug.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/50758009558.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/32621351948.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/rijumama.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/416400bc399f525f622142f97e2c23ab/tuxudadu.pdfIn PDF document text
    • http://meskerjager.nl/media/files/23694605614.pdfIn PDF document text
    • http://blackshirts1961.com/clients/7/71/7137ee3fbd99c17d296746b31d66a47b/File/42160959508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=inductive+and+deductive+reasoning+worksheet+geometryPDF 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_off0000b64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64D 16984 bytes
SHA-256: 03a1607cc53ff0df233cd2e7119c47c6b3d67116a3d5611c6f2f8688257134a7
font_01_sfnt_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 11180 bytes
SHA-256: ba7b7ae7e2bb2eb7849aebe98c50fe21830aab7797185043f6f6ed6ef39df7c7
font_02_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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