Malicious PDF — malware analysis report

Static analysis result for SHA-256 844c2756363d2a8d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 11:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01a012a72588d2c2f50698736f0818e7 SHA-1: ed070583171d444e1f9d51cd4873156dc85d8b30 SHA-256: 844c2756363d2a8d9ea3f9fe5ba966b5e58663da41db740819ae7bc02a958ce7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites and IP address literals, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae561613bb0---medalukagofofizi.pdf In PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/kutogiviwoxuzedowizibiwu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb9875a74---jadulozinefaw.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/41397651205.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/wefivibomuxezabaf.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/zazivegemiros.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/toxoxikixaxozogimuzula.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/94163287858.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/24843779354.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161099e30eb9bc---misije.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/59408196559.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160762c974c312---tipereravi.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/retudulametuwinod.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a50af1a1f---fukiposizuvozex.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c48dc59a879e29822075c21f1a2d9cb7/nufuditi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084729f90d33---71832666085.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/6aa8bb79ae924e0651f42438ffa61f56/bozezazogo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/chd0nkqjs0r2t0jv9eld4db3m0/devavonodoxasir.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/81114255828.pdfPDF link annotation
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160700f8d3ed18---58601773884.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/34040850916.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/27483287237.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/89561042023.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/rubomavako.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/jitafirokukeb.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/9s1kh7lh2ju8t48tdsk41593t4/25189480076.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/rogipujuluvisak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=marketing+management+notes+pdf+downloadPDF link annotation
    • 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_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 17220 bytes
SHA-256: 91db478ef10a92372e05b338748c181b3adc9e092f1040b29809af8bc7755cd0
font_01_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 11012 bytes
SHA-256: 03ea5038a7ddbfea4c8e4b33f1e09109a86dd09cb20c272d1a24be3d2bf28692
font_02_sfnt_off00011e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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