Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a6c06c8bb46e3a…

MALICIOUS

PDF

100.1 KB Created: 2021-07-13 13:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 043ccccbfcb31527027ddbc0ff7cff31 SHA-1: a71291b5480af8d9b8c6a8bda28b41e912f34cbc SHA-256: 59a6c06c8bb46e3a814bebc38c024244cbf4df3cfad1a620cd38bfffbbaa2f65
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://gadd-asso.org/userfiles/file/tapafasipezana.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e82db03a2cc---14854215465.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f40293b1a2d5f9b0d546103ff2ed0e7d/12124867885.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5f8cd73ea9c5b5d345cdccef3cafff11/zesawip.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/cca14340779aa7918fe574f8a23a0612/30471682696.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/acc635e72deaf79a7a89f7b2d0cf018e/wudota.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/91692650312.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b24c81a0433c7b7a87a845cfa74a59ff/95414401245.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6fc649a3c---99568135396.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jahfgiiavtluj73pno04ubebuc/fanedobokugibuvusobamafo.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/87028324044.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f56b29cc8---13190321623.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210609_2D9234A8E30701AD.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ad25df027f2---saweretikisutikobuzolijan.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/kesatarezosunidimitezalax.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/24987322048.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608edfece6ca4---59106954444.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eca78c6c97390825db67a0023d0e55c7/zinapavifepiveluvubovezux.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210524/file/16218638425113.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/58832624611.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2ebc15210b4ff39f8eeebde039465a63/55182323956.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/793e2a8bc0631813100ce90bfbe27f0e/68942416637.pdfIn PDF document text
    • https://luminex.pl/upload/file/23017170501.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/niiunnsfsn38q5m1svdhshoa1m/85300552672.pdfIn PDF document text
    • https://banghenails.com/upload/file/23505734195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=rhythmanalysis+space+time+and+everyday+life+pdfPDF 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_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D87 10988 bytes
SHA-256: 5008bb985e78001d33b24169eedd08556946f26986295cb45694c5bc9a77ba4b
font_02_sfnt_off000156e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E1 17008 bytes
SHA-256: 1f448e45b53fd25673915827e768a9460996659843da321b1d5f414d4e03e4e0