Malicious PDF — malware analysis report

Static analysis result for SHA-256 a902bbc78b78753d…

MALICIOUS

PDF

120.0 KB Created: 2021-07-16 14:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 657415a279bc4fbc4b01219a6b452123 SHA-1: ab0b7e9a26321e25627b72c34fe1b999251ec660 SHA-256: a902bbc78b78753d3ad396c20861bd69e020696d7c6cd71ef28bc9a677f5e87c
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or engage in phishing. The presence of these links indicates an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=text+lite+mm500+manual PDF link annotation
    • https://hotnews.md/upload/userfiles/files/11563495125.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/xopifobubuzikijekebajata.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/j46370clcrv6rakp4176ci1je5/22501267637.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798e5e4f4ff---garazif.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae6435913---6848142697.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7306a6fea---femodunavagezuxel.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074124cabbce---lofese.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a1b4ce96b38e49e42fa1b76331c37f09/39739311804.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a350121ee07---93286899360.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b54109fe4---74743961230.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/14036360349.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5cc33a3f9---97484860715.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/38976212217.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/8748333022.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d14990b90---zawuloteguwedukodo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bd233f87585---gonowoxaka.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cb19d0576---69810248343.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755c8ba7d6e---zuvegaw.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2f6f3ec7---gafilanovugowinuboki.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/zejiremileboratukodavi.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/rasefe.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b50496d7c12---61909756008.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d7ab09c8517262f9f859ebe11bd6921d/676535909.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDE 10304 bytes
SHA-256: 150784862267761e0439e967b68035dbee2ea41f9f030e333966367eabd8f904
font_01_sfnt_off00017319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17319 18232 bytes
SHA-256: 7b2306574e4b765398378b5d2161046c0b2b5783837b678b3e206d33b91dba3a
font_02_sfnt_off0001a357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A357 16120 bytes
SHA-256: 5cfa37fce0989fcd98349beccf9a63719aff29e66b00f3ba655f54b68a91f5d5
font_03_sfnt_off0001b8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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