Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cf2d5a42eceadd…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 10:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f701b1e84336c07441d127afb7c7e1a SHA-1: e4e3cabeb949ab45aa648b71b7059b95ee25bd87 SHA-256: f1cf2d5a42eceadd31486da34e2d798c7b882eac96ada4ad93def7d2447c108c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to distribute phishing content or download further malware. No scripts were extracted, but the overall structure and URL patterns point to a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=pokemon+silver+download PDF link annotation
    • https://virtrade.gr/userfiles_lybo/file/98837120683.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/71508253051.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0f44048bf9e5cda6933bc40e7e371c8a/40628452300.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/lonulumuvutelawanomo.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/zipevanixikerenadepunaso.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/sametagawefosamotakixot.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/vixezomenosavus.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/63289228689.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/75057903078.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/39146250496.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/musimuzelezixejunez.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/womejujamumuzegej.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/kutuzileloraxuwulusokafo.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/suwez.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/30116440416.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/63831615763.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb30d796b---6473779153.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/sunem.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109082321463600.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/38140403530.pdfIn PDF document text
    • http://www.autodesguacecoin.com/ckfinder/userfiles/files/ruxefefewukisusuga.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/69ffc0l5hm8pmdc1uvhkmck7fa/kedafexizogexulusinumur.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/xoruxaruta.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16147a12fa60aa---40925654746.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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 17768 bytes
SHA-256: 5481e0e25224f7b43cc3a7845a89b8dcadc648b8aaa2093ade1ff5f1d88afed4
font_02_sfnt_off00011b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 10556 bytes
SHA-256: 2e506e19eba90ddf8107e0c764d5b78c708d3fa5105449e13cc35a7334fbeb1a

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