Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e8950a3c7495e4…

MALICIOUS

PDF

87.1 KB Created: 2021-07-05 03:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dec26761862dcff45f4fbf804a1f018 SHA-1: 2e7e9b42c1b57f40c9d4f6d3c536f0a6ec363a36 SHA-256: d6e8950a3c7495e466b739abba3c67a9c6b8b4d23a3d23738a4fdbca1f012ba9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of embedded URLs and the PDF structure suggest an attempt to lure users into clicking these links, potentially leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a0b2c818f0770eeaf45372c312b3c133/rudirobutibufo.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/51cfa85de264b03810a4fc9257866c01/56015171463.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/7kj5njno2nqsp098s2nasgarjs/juniteboponuxevin.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8913990dcb---23623483592.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/sagaxola.pdf
    • http://praguetransfer.com/files/file/9066120735.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ael27ksg47t2s9l5c5qupcrqlp/38560811164.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/zetojirojum.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/zipakoritifozefasodakow.pdf
    • https://sunrisepool.net/userfiles/file/xojijebo.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed29d9f39---69701625907.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1db5bfa12bf172cf960f99c6208e2e29/60263376785.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68bcac51dc---gosuledusogamiwanakofo.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5794a6c1b1---62135084915.pdf
    • http://garmagostaran.com/Upload/file/bomewixumowubarira.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/97337721473.pdf
    • http://greaterdeliveranceministries1.com/clients/61527/File/70754532175.pdf
    • https://temahr.hr/files/68908153926.pdf
    • http://blessingsngo.in/userfiles/files/73826106255.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb0e273b77---fesoveputasiku.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6e708609191840d556f80947a8ae4134/50638960392.pdf
    • https://detmers-kontejner.hr/files/74994964540.pdf
    • http://sakem.org/userfiles/files/dorovepatuwezokoxetosipe.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/koxijakogasovib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=resilient+mind+counseling
    • 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_off0000f353.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 16792 bytes
font_01_sfnt_off00010b65.bin
411bd08a97f75cab75729f1882ef8c65e9290fd75e94dbc352d560a61165ecae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 16784 bytes
font_02_sfnt_off000136fa.bin
15c42c8951be2092e3785b7bbece3f613ea40d7456ac580c9c9a5abda19c5d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 10596 bytes