Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f13d94df5c306e…

MALICIOUS

PDF

98.1 KB Created: 2021-09-02 14:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dea451511e5b73c731326235b140ac13 SHA-1: 7f9fbcc22877619ac02027843b34579168073f07 SHA-256: c5f13d94df5c306eccb067fba4f75d3230fc8db0a67447d5fc805b36d0b2e9f8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, with several heuristics flagging them as pointing to potentially compromised websites or raw IP addresses. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL patterns suggest a malicious link farm designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://blnk.eu/userfiles/files/9031026294.pdf In PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/xevadokogatapup.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/vqjhh210n7nproe7sj0as3stsg/zivejonugugugumirevubilit.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/70443753724.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/bikegokib.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/sinigogesejovegerepid.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/11635912805.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/rediduxapure.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a353226d8b1e41362373939530b63ab1/98460106041.pdfIn PDF document text
    • http://cpils.com/userfiles/file/10599513429.pdfIn PDF document text
    • https://htchninc.com/d/files/79338378108.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/96850163902.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607665a4ed980---lujoxilamibofejuga.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/10108144401.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/7972736107.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aac5846b6---xalabisusoxavatopunanoda.pdfPDF link annotation
    • http://palestraarkadia.it/userfiles/files/55958680166.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/xevidiwaxefag.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/pilejavarixefix.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/botoxowolij.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161026dccd7d77---90162571868.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/91245041296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=saline+soil+reclamation+pdfPDF 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_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 10856 bytes
SHA-256: 027be55e9972d37e6ed2e16532ee1fcbcde47ad9577ed371bd0c1ffac4e6b631
font_01_sfnt_off00013334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13334 18504 bytes
SHA-256: 0f58e741d3bb836cd99a07b67a97dee479e33e532dae007559fa700ffbd0d4b7
font_02_sfnt_off000162f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1