Malicious PDF — malware analysis report

Static analysis result for SHA-256 08aaf3af3275d119…

MALICIOUS

PDF

150.4 KB Created: 2021-08-20 00:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f8825cd8277bd21656073c10240e7807 SHA-1: c97fd3d65bf0e130564dbd0c5487df3adac22de0 SHA-256: 08aaf3af3275d1192e10d5cac7074cf163d88f6230cc09626c343a495decfd3c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9246

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://archism.ru/uplcv?utm_term=mechanics+of+materials+8th+edition+gere+goodno PDF link annotation
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f11d7783---vasusupipobujakolagude.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/sujupuxor.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/xofomepateziwedod.pdfIn PDF document text
    • https://sbufficio.it/file/50534908344.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160885c3461f2f---16792520501.pdfIn PDF document text
    • https://iwistw.com/upload/files/8173365031.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/de9d0b3a25344c0a7fa279b3432d72b9/68808598728.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/tanoku.pdfIn PDF document text
    • http://mq-water.net/upload/tumoriwitomesekareder.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/muwadikixedete.pdfIn PDF document text
    • https://ka-base.no/images_content/file/sigotelevanonaguz.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/lirigezu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/19e5ae8af3e0bff6d4ce585acfdb489f/79435990896.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/27560978610.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/16021596189.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/vereda.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/r72j9luuqaoq89c12iq4n0m17l/jobupigeranelolekukutofo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e655098d837---75976339761.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/84509625775.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f5ce6152f6099d57a75ab3595602d7e0/buzoj.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608004412b752---97724992785.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b617fcf28fb4cb1fdf6180d1f26f0a8f/15676118776.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/gasuxumorumidafifoboxigib.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609074a7b366e---goretogujumexomugumi.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/jibuxadedawonuruma.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/semomuzadode.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_off0001d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D32F 11124 bytes
SHA-256: b1269712502d1a71c480824cc923fa35031f921505d33406935a5eca1267192e
font_01_sfnt_off0001ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECBE 16060 bytes
SHA-256: 3108d61b2da1918d99a90e856c479b5d8c01ba231e7a2cb0053438587654845a
font_02_sfnt_off000201c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201C6 18360 bytes
SHA-256: d6be9ae38aa696bab351adc15ff0000e873c3f3e936ea9e6ec0b154796b33127
font_03_sfnt_off00023129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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