Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc30594ab60f538…

MALICIOUS

PDF

82.7 KB Created: 2021-07-05 22:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e473cfe8c7827e22ebd63b735fbd967 SHA-1: fb819701512c67a478858d9b75e5c1805228f833 SHA-256: dfc30594ab60f538068d57346d6001e6816338da57cf501188490380bacb2c34
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phishing pages. The presence of multiple links on potentially compromised sites increases the risk of users being directed to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/sie74v97nvrkpsfavgteg6f7jo/8701238188.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8f0cb20f---gorojatenuroletevesavoduk.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb9f8962f---wudovodezorowo.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3d5f6a1cde1fde4c43bbafe77dafc8e0/28363681001.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zigewuri.pdf
    • http://kanstm.com/ckupload/files/95328759009.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b03226a17a---55267277006.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1947ff39---74254665640.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa6f0ba93---71414433607.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/5474ddef234f94094cf525d748fb54af/lukupaganuselejiv.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f7595bfcb2b622557ce99b121affe7d6/96327297270.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082cd30b3d5b---72634126174.pdf
    • http://dokumsuzgec.com/userfiles/files/86278489192.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210518195951.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c7a59061e---821611068.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0fd8a478---nuzivanewug.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2226040eaa93620154ac4aa7cb181627/45849687460.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d587b824d8cdfecc0aec8bd7c1bed0c/9859836883.pdf
    • https://netshopnepal.com/userfiles/file/kopetametamafujuzifi.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c646d906d6dc257d813e92085702dff5/67218708826.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c217cb07c---83977584694.pdf
    • http://jdhs77.com/clients/58520/File/69449305892.pdf
    • http://slsnn.ru/content/files/menali.pdf
    • http://year-c.com/upload_fck/file/2021-7-3/20210703055230299719.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=song+o+come+to+the+altar
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33b.bin
91cf8f7839f1972664ca012292159b4a7312a22e876219b99017401527a1f99f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 10492 bytes
font_01_sfnt_off0000fae9.bin
9d115fda9112feb12b7a295d93b42d5fe8676e7cf350aaed8f3b88fa5664a264
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 16524 bytes
font_02_sfnt_off000125ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125CA 16792 bytes