Malicious PDF — malware analysis report

Static analysis result for SHA-256 729344130565ccb7…

MALICIOUS

PDF

151.9 KB Created: 2021-06-29 01:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 11bd2592782815c3e9d75bbcdaff28d0 SHA-1: 6183dec4a6f62f5e7713c14bab0ac81f2c4cae17 SHA-256: 729344130565ccb77e58c703a920e209aad1ef801451c10070fdac5a09c921d3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or redirection attempt. The presence of numerous unknown URLs hosted on various domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2947e8c8d2---davavarozirunova.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095aa574a3ee---pigitifuvegobak.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/zazugakapirari.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/08bbf48e4f604b13275904d8ff895751.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/43498428143.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/xejivigutafaboduv.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e73251d1---gekutape.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d53973686e---96719538251.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087edcd268ae---25535872121.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/06628f3807c6fd4a1c6cf4fbf16c4034/74559846632.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cb589b43---26453059916.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/26651691148.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6c0bb94b---50623796422.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/llcja01rnrubemvlm1iavs98u1/polefuvixowejabosek.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da480bdab---fiwafujejatofevu.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0650797d81fbcf61d752ea9211dd7f07/71049472464.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/9vqqut7t5eb6ngu57aes5fs0g6/kozorovamo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fd018ed99a798a96da76a4272a5aa3f7/51684673743.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/wukusafabuxifemaz.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e9e9aa0b---zifufuliwofev.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160949d5487617---fujeritewizejatago.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf39a7692b---naraxegate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=splenomegaly+treatment+in+homeopathyPDF 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_off0001f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F41F 17372 bytes
SHA-256: 111a659d15bf16988a5c889d4317207b3b6a6447fa09e90aa8f57caeac1bed81
font_01_sfnt_off00022183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22183 10720 bytes
SHA-256: b0ac84b39fa48560fbb8d3c4fbfa314c336d9f0678bf5b652bbb9dd06fda7a9d
font_02_sfnt_off000239f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x239F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1