Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11afbc7172987a2…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 21:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c73c8eae2af9f6e50e2a68c2a181935 SHA-1: 418460842a9272686aeaf2ac8c3d0e63fffe75f7 SHA-256: b11afbc7172987a2df2869fe26c532b9e65d1950f33bb1f8c8e00a01892a9bdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or facilitate phishing. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160abb01e7ab65---42528122927.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6464b41fcb2a997f9b000f14b3144f6b/2127002452.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bd73c98a0693d2eba0a50fac8bdee3cb/fugateronojumodebipaw.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/1309429be610a00334e26e0172ba6e33/3563578443.pdfIn PDF document text
    • http://wernitznigg.at/files/nubidenidovesukidaneg.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/abke93ok3oiseuv42l8o5vhqf7/66148491932.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/nubemapim.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/25582238940.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca02e2c9f8---fegumodujonekesoradedoj.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe4f19ab17---terutin.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/jigumo.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb59592e8---46968851657.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/jebuj.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69308225079.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vowagolaxenavizavan.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/41506573120.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/21431989598.pdfIn PDF document text
    • http://tano-cable.com/d/files/ganun.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/kibivivodul.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9c0144c600993ee40126f559f0ce4ecd/ligedimuba.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2f88842f3---doporanomat.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/fadokipevizabenunogago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=lector+de+voz+pdf+online+espa%C3%B1olPDF 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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 19156 bytes
SHA-256: ede6b7ea3725920831c1a770c6c6e01ee866dc98bc128f67e0f7acede37dec8c
font_01_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 10900 bytes
SHA-256: 89fbfb604fa2e169798556d6b4bb33037d366647bed5d00159643655898ee30c
font_02_sfnt_off00012b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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