Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8aeaee2dc1ffa4d…

MALICIOUS

PDF

87.4 KB Created: 2021-07-07 15:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8354b14aa90a381cadaf7129402164d5 SHA-1: 52e83a78e6b490a142ca2d0fb1b65f7273684ac2 SHA-256: f8aeaee2dc1ffa4d987d4dc237ac5b51b0b17d3c1b895c947e165054784afee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chcial.ru/uplcv?utm_term=difference+between+simile+metaphor+personification+and+hyperbole PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839f8041677---xolerejagoxixilisev.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a731b4de848dc4da47a911111bb8cdf9/90489970739.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/92706e1007665a482290dc19c7cead0d/vojug.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/3qampfgrgsoo6ndmp99ju0kl9g/kagifem.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/72860853155.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6236e7677---seripazotuba.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/34127203386.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/ptkj6ae2s8ak5fkq533ete1vfq/61748500974.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160beb29731541---sinarifanuxa.pdfIn PDF document text
    • http://thongthien.vn/upload/files/wimufuloxipaxavazatiba.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/63a56beceec712baf8797d334586b8a4/zapepamuxutugovunoxe.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8bfd98b5---51577654286.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/91bbc6b78e88ea45f9cfd736c56cb187/9334507485.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/77d15c20bb6d49696e9624bcfc9b4c14/39243262512.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2db4345b445847e9dbcf97a9888ec3e2/85304408208.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2klr7tgud5fm31rgh8jlq687jh/nagifegofobitaziwefewuvul.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/47339793651.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c99a655d33a---22266238746.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/doperenofa.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/40139205616.pdfIn PDF document text
    • https://petala.gr/userfiles/file/kejojozemadebepexix.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16090e214ce611---jegowuzi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc22ba3155---85979938130.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/71290547687.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ijm1ug0guuje8i7fr8pbdash66/68028034628.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d9e806084d6ed02c3f34800cee16ab4e/wijajemizava.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_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 16884 bytes
SHA-256: bfcdde01d54b0fd6d69182e8a7bb4715dc2df745ccd5d92d973c522edb4eeb1e
font_02_sfnt_off0001358e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358E 11224 bytes
SHA-256: efe38750562e0b74d86d6d52c62f359637df981a1f98effd20b19807a7ab65f6