Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1c5a3e00872cfe…

MALICIOUS

PDF

92.6 KB Created: 2021-07-10 04:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2dcdc7f8ff65e0b515b0cde5367d3f8a SHA-1: cdc7ee6740b9154bff2dd13e7cb24678c6dd8b0c SHA-256: 0c1c5a3e00872cfe8d22979045e0b740986b0123d407d2b51e48c700c63e39d2
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://medvor.ru/uplcv?utm_term=are+all+living+organisms+multicellular PDF link annotation
    • http://urbancollab.com/userfiles/Proj_Name//files/50676075285.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/24810397684.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/wowuxamodej.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca459667e---dikaj.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7cd05489---23054940992.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbec697aab---90191245270.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/76531186737.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/npni2aitu9rvoqi7lt2mvjk2cr/96247027664.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/gewonabopoxanesodigawebur.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c084e7eff54---jobinavopivafidopatulatu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/25c457149419dc33bfa141f20e759178/42248900582.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a63cad04---33866925740.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/83488907306.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9c3bc3c6d06da31b10bc639b16614242/44968181226.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a154cd5a8a1---mejadepeberijakojorekizit.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/uk71lg891gksd64d0oubpfet2k/jibazilolugotiri.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qod4276bsu0kjm5sc2t01h48rt/vomovesigaxumi.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c99f4876b3---fubita.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086036343166---numenojunovilakekeme.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/kojokegizigesujuwimusiriz.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lfddkdnr7o73v7li8b1hpvilv5/tumajarawavikuzakif.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/84134344591.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f5b905e2---34148174607.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/xasisa.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_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 17172 bytes
SHA-256: b5771f449115db1c546e2a5b005e3b486d0430ac3560e048b7252cad63eda44f
font_01_sfnt_off00013473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13473 10720 bytes
SHA-256: 9a965262a291bdf00431d95cdb4ec7cf33f71bbf09e9cfca2bc128600a7630fa
font_02_sfnt_off00014d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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