Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6a8a67ceb91612…

MALICIOUS

PDF

85.6 KB Created: 2021-07-15 17:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9c1a42dbe3d028599943d4307663b5a8 SHA-1: a246cd0ea3bd952bbf2e229cc7118e4a2ab17073 SHA-256: 2c6a8a67ceb91612da230fe6f02fcd1683174c66649913a72655e4d7402a2b7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=what+to+evolve+with+unova+stone PDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/0b2c7sm34dv6lsn0jhunl60gcn/xixapenisatulofiwaku.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fd2f39b1---11524275345.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/zigomipegujenujegof.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160930e00cff64---mulufakogajobatabezozawa.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/desogopisaxifojedum.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/18481710019.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/lipobepawutumiki.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29593f534---17491052986.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f133115de6---52474421684.pdfIn PDF document text
    • https://retta-bg.com/userfiles/gebaxifujafizi.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/vuvugoselosubezesav.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/77299091394.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67a66162be---dajorife.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/69063065514.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/vovifalufomunideko.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4fb173dd7---49617168931.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701b4a0158d---58607407395.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/167p989j0haih140m3blloo7ge/30703097731.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/soxezapubamesefuxijudo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb9019963---kojukira.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/xirugowawagivotetusi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zopoxiwu.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/725aab174e9353571d3ee9a27fb07928/86178935401.pdfIn PDF document text
    • http://grimastone.ru/files/jofijusutigigu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29f360f5d---73413877787.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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 10348 bytes
SHA-256: 34d498eb915f908b4540c6855d91a354fcf1abd45635a99e3875eb90977ee60e
font_01_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 17408 bytes
SHA-256: 461072cd43447ab4f3bb08789e72d04bcd6e4fafca0231a930eafedbf1571795

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