Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbbf78754700cbe…

MALICIOUS

PDF

74.0 KB Created: 2021-06-28 21:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3edaaa2eabe5012bdd7c4ed8a7a668a5 SHA-1: 524e4c6f2b6db4f0a3feb438ded6b1e4bde28687 SHA-256: 6fbbf78754700cbed9807e9eb8701ab280fddbca17a30461766ed5df4824e934
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, indicating a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://dolcezzecaffe.it/file/nesipipovivivefonuvov.pdf In PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3548689cc2bbd6c42d7b948ae44ccada/tesaluk.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/68800279932.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/kegorinuxoken.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vf4jt9ovfnbrch7vb15pbd3pjl/vikuwokorudolejev.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/i36nf2jo3qq9fd63du3dbk0mid/temew.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80816dc3ea---46260664353.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/66d8be63ebd85805e72fe81ee543c630/63299962247.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/18cca481e1322f21fd57ee0475c162a5/54250269699.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/91066332267.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/bk70tn3pg54t5vqpscpcl4rcdj/88109857378.pdfIn PDF document text
    • http://www.toptehnik.si/images/xubab.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/14426513267.pdfIn PDF document text
    • http://candientushinko.com/images/file/32714027728.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c9a2d9a68---61207059634.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b5bafc6ffc7ea24e101a643810c16d9e/95063103751.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d7cd40f67a6b05558f9c39b80c55261c/fifixuwini.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/vopejirutekomokotemu.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/jilizi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6b6ea6c2---nunezabilu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/34776a4822a5b1a51be324dd6185cc7b/79141170046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=open+pdf+in+word+without+convertingPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/20b2cb18dc2ac30a88b7ecae74d498e3/22899994713.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_off0000c07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07F 15900 bytes
SHA-256: 05451a58e12528985331b2334a56a56a8087771078a50e20eb1cb65d840b148f
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 10800 bytes
SHA-256: 086bd47e10ae037bd847430b6790fed070fde8a9ca7817594b89a6f0019723d2

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