Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf6fce0a0593171…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 00:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c6d95b711b4530931a209a4cf70376a SHA-1: 4e6497219c2d20cb58a5cc075d0e053fb0e29852 SHA-256: fcf6fce0a059317130fe07efdab0cb3a558a05868f638447109ca0f06c4becb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF identified by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. The primary attack pattern appears to be a phishing lure, directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=briggs+and+stratton+1450+snow+series+service+manual PDF link annotation
    • https://asthasupermarket.com/userfiles/file/pususopilikuvifojo.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/26991061337.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/59661138808.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/1647127970.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/kunanakobodunoworugofo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161254e776561f---48043659964.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/korezefesuwurulalunawojej.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607823c075c6c---difukagiwu.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/36237180820.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160712b16811ff---99312076526.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57844925223.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/62402655167.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vinq35d461pnq6ke0amnnqrgv3/65252819941.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075a32147968---filoluritulasegopipedonex.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/siletevapadozizigunemuda.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4c29c125---15965613449.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/70569966230.pdfIn PDF document text
    • http://fullx.net/files/33614910199.pdfIn PDF document text
    • https://matratva.in/userfiles/file/nenaderaloninenosakedipi.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/modisobumojegizumol.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2975b2207---sofediximujadisovovete.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/9e70fb59d13cfbf9af22e0acc04bed23/goler.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_off0000c069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 11404 bytes
SHA-256: 2da1f1d2293bfee861332028671e454adc2260c2365bc5057cdf079ef14ad2ba
font_02_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 17940 bytes
SHA-256: e5a63b4b462f9f27c3f2b4963c9b7f98134befd9096ac330eac7847c1c68799b

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