Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d7425d6392d5f9…

MALICIOUS

PDF

64.7 KB Created: 2021-06-18 23:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c55571ff7acc53379c013439524b91a4 SHA-1: aae52d7dd7b773f409a940b9c779c39ec62342b5 SHA-256: a9d7425d6392d5f9350bc8e48b6de386a7a1238726d6d4e446811ad1c7c3d5fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites, likely to distribute malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into downloading further malicious content under the guise of a free technical book download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794a7e96ad0---42787193255.pdf
    • https://lionkingbali.com/uploads/file/rilurategeterufike.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/8ae948f136af94588223376465316885/37142711807.pdf
    • http://ahxxzx.com/userfiles/202105/file/gatokinamusutej.pdf
    • http://adria-ex.com/images/blog//file/zotevesudekivatile.pdf
    • http://stylowa-pss.pl/userfiles/file/pekomikarojituduge.pdf
    • http://hglobaltour.com/FileData/ckfinder/files/20210618_A4EB1311189AEAD5.pdf
    • http://yishiweb.com/upfiles/files/20210602_201620.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f61423fb8---33266538413.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160982c36b3360---73478947608.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/jiranarafoduwaboperi.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/36395644209.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ihu4t9d23ortoleirk3c3s8jqr/zelitibebidoti.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/87340f22b9d5ffdaae51ebcef488134a/vupogazidujejenojadasuwo.pdf
    • http://sevinctekstil.com/resimler/files/dejemukegojelulej.pdf
    • http://446888.top/userfiles/file/dolodexevodojinowilidose.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b3cd044d3---44889067009.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=machine+design+khurmi+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bed2.bin
d092b4631741a8a99925ce71aabcb579868bf176edcd4a56499ce75755b281ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBED2 5728 bytes
font_01_sfnt_off0000d244.bin
c983c142e58aef0bb613bb5215e30fa6ae9af7a43f3768ce0eb077d46cd7b344		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 10512 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.