Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d0141287bbf986…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 04:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc9f831178b5a9a1cca5a80e09dd157a SHA-1: 3d008156628115a7b89e3b5cf2d7d52215215526 SHA-256: a1d0141287bbf98681d10032b0b1f92c06abac8f75d305befdc733689124b67d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It functions as a link farm, containing numerous external URLs pointing to compromised or disposable hosting, suggesting a tactic to manipulate search engine results or distribute malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aksaaydinlatma.com/img/editor/image/file/rofiladepajo.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160921327803f1---duvus.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/42741855423.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a647209c6b1---59096363738.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe46eba3b---xunaneseriwuwuxavuxagej.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/12079748529.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/savimajiva.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d697c10df1b---12567004934.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addec1e6fb3---34086609435.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607797e208c97---81543420389.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/18980859312.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce9044b6ca---levijavuranuzotokoxi.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/72099759219.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4e63e6e5c04b8b7cbd44bc9bc49bea85/77071781348.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7d8950fd4---44312891449.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/kejejujewixewi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3edd7c712---11596443620.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/ragimepobaxijiwedoferosaj.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/d3mpdvhon4hn7ja9mqcnkdfb93/72270279979.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/2oin2jm5cim9at9d2pcvfdqv8u/lolagaxedefefijuge.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/sodilusofaziwubimaretiga.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/xuteno.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/77530216638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=political+science+mcqs+with+answersPDF 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_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 10728 bytes
SHA-256: d1a71dbce41c227f01f07c971a1967a33da067427e8b10ca3b6050d9c3504053
font_01_sfnt_off00010104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 17172 bytes
SHA-256: e16bcd7fa23a6d13b90a3e38777243a8ac395a0eae605a6e8d0f23d3481a2356

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