Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e77d30fc8552f5…

MALICIOUS

PDF

79.5 KB Created: 2021-08-28 18:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bed80c208d05c77c65f9684667e49b4e SHA-1: 36f6412e496221e43555775a2a04d44c97f47197 SHA-256: 63e77d30fc8552f5f1c4800cf9b675d3a6c79eb735ea9bf8f226647e963cea90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised WordPress sites, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=animals+mating+with+human+beings PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e38346214e---9710453661.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/rotevodubuziwavajuzaredi.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/57319259034.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/debevoxunofalajew.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/75592150288.pdfIn PDF document text
    • http://chongros.com/userData/board/file/9596500532.pdfIn PDF document text
    • https://fivetc.net/uploads/files/benamanumutob.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4a69b5cda4c9f055db74eecfc5088402/90971781263.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/f1989fc1033ed57e9cfc14e11834f161/55171234718.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/nq8jq8tfrkrekb95agmgfo9442/pakesitogunidejos.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/wamasojivomupizawiwot.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/45771015214.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/26180405515.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/473d0168160ec32ff51c08959ecaa413/xukexexajulakolexekijinuk.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a267411d6---dijoxemosas.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/44391494750.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a00d94a5b1---69670954095.pdfIn PDF document text
    • http://synfarm.com/upload/files/jegikamosoxomiv.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c32ec6cf18a4b349e6a8bd0925180328/12861614810.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/44111898915.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/4ilfeqr0okpblmramrfr3d9307/kuvelodufofudemixu.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/18929850016.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd13d7b34b7---febizapopodir.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1bf5nh5u54hu83fcg035f7ljnt/kojegazef.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ochpplc5ea32nj7psdcs0q4e5n/kugemevewomofuwi.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/dupumazetus.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_off0000d2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 10644 bytes
SHA-256: febc9e998faac5be9116e26b83867f937ec643f35e29adc0c87bd29a28958091
font_01_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 17320 bytes
SHA-256: 727c0cfbfca4c32d50689b1bbdaf1c7e49ffb0b19a1f48ac3df0a08395defb95

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