Malicious PDF — malware analysis report

Static analysis result for SHA-256 e315d8535d31554a…

MALICIOUS

PDF

81.3 KB Created: 2021-07-03 22:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60da5c535198435f8264c87983b3fb13 SHA-1: 88e2c6203c858f95b9747bd7e33cc01409768ea7 SHA-256: e315d8535d31554ad0bdc8f93d06dca8cb3243806fb8ccef695c34281c2ebc83
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress instances or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076204333455---junipuwepaxapewimabud.pdf
    • http://zovsh.com/Uploadfiles/files/49251136529.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0daf00571d---gexikikufewolobi.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad1813029d---nerimavowidebolaw.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/tokalemiwap.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/e0qc4mtttcq1mkatmb02c8umu3/welejibonemitesuzogalabu.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a01d7786113---letavilakuvidaduvabu.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/v5pauav1hn2qc06lvl82scrkn6/56157679145.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609974a472323---5829309782.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/pijpjnpr0n9rq4bc27q1qvo2qg/vunuru.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083b03b16e4d---bewejerinafa.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/mofasewisizu.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef7616c3b---38353378035.pdf
    • http://beiks.info/public/file/72476603125.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160874d3149d4c---bozumomeginok.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/jawudiwabija.pdf
    • http://silesiacapital.eu/data/file/magafurugi.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081afd6dd627---48952281649.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c0ac46c30---kisowizafupukagiju.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87585951b7---tuwemepajibajovok.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/21473b485b88012765aca5eb301faa73/vazifog.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7e879fec3f734bac3fe71b276c23bfb8/tatitafobotitekat.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7bcc566b---39209283034.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b9358bd6---jedukirorirujowugudujemad.pdf
    • https://paperland.bg/uploads/file/84820325599.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=youth+football+tryouts+near+me
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ca.bin
2fd3df1de9a8b95944120be46b58d5d63fcb9bd4cb8bbf92d1645cf7975f0f04
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 17968 bytes
font_01_sfnt_off000105e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 16792 bytes
font_02_sfnt_off00011dfe.bin
f2676e5308198936a1582e7bf948ecff6fac309668f1b8cdf22e7ffba9a83f23
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 10724 bytes