Malicious PDF — malware analysis report

Static analysis result for SHA-256 878c25aa3260202f…

MALICIOUS

PDF

211.9 KB Created: 2021-06-26 16:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 428a96563a200dacf1a037f568e4d3aa SHA-1: e1b5d1ba427800d96359e507a62e2fb5dfafed6a SHA-256: 878c25aa3260202fe6dfac834cc84145a2f0c6945b6a388284be7a867bf464c5
166 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to a compromised WordPress upload storage, identified as a lure for free downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it exploits PDF vulnerabilities or tricks users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/da899603f4ff81354ccfd9df31d235a1/piresakedajenapelotijazi.pdf In PDF document text
    • http://studiopol.it/userfiles/files/betimif.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d13928ba6---46862188413.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5e624636364085e344cb2b980a73fb14/1888166096.pdfIn PDF document text
    • https://ebooksweb.net/files/file/bolidowa.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210608_5A5BF564BBBD6BA2.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac713bec1---detizid.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/pelefolitobagukazopa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61c9df8fb---gofevudefuvuxoguloxo.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/40525478441.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771cf8c595f---45871765757.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/14183379235.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608939bc70e56---sakaposawikevapalatox.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/39179490723.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/69d3f0c7965e0e18ce7eb1e56c037965/mozajikozimasojesal.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/dc8bb3a0960b155b47dc41479ecc5fdd/losegimonevutepirebelojo.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/97694032300.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/743aa20062d9a3fb0cb4c2e59772cb5f/85030938743.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/vokubiwegekej.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/jajininezokapanamepokak.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608528f63b63d---59263903649.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/ba86b85ad8ce92007beb799bba428638/83118255523.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5707a74179cba52d937f533fca940906/munolebabijajuz.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/guwowu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607098ef3ffd9---72013255651.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/acfa5097e76115072c0870a6f3c5fcbe/wokudamifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+outsiders+pre+reading+activity+answer+keyPDF 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_off0002dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DC35 18660 bytes
SHA-256: f7ad845a97f56139852d740f6174256324fe327a6a1b64bad0d5ada19c367196
font_01_sfnt_off00030d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3256A 11168 bytes
SHA-256: f8a0aa630b425d04ee1ab217655d012a89c4667f6c60240c1b13e9508236e8d8