Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc06b2259321e023…

MALICIOUS

PDF

86.8 KB Created: 2021-07-14 02:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6e6d9edcc83573e957709863d36e5c45 SHA-1: 6be66dd269c5fd3b12d01a95a7c4f3a0802cbbe4 SHA-256: bc06b2259321e023a554c9b2b21bf936a2f6f5518d3f529bb5f79ad0eacd938a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites using the Super Forms plugin, which likely serve as redirects to further malicious content. The presence of multiple external URIs and the nature of the hosting suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://wastran.ru/uplcv?utm_term=thank+god+its+friday+funny+gif PDF link annotation
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/fsbq2c8kobmgk8vp18j6lkd3v3/54789741327.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6f4bc6594e8174320c21995ac453a124/68292684955.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/17f436222ffe2091b2a260fe179812ea/28138539415.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kujewutubarabi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/44402908753.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f1a47e062---rovipobomuxijevowute.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fezelanibaver.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7c2cb77922634419d110b0faf007f0dc/momapep.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kalevubikusedenegeve.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5df0b3cede---wemogolusilegejub.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/92097824688.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ee2471ade3747f8b3482e09ab9a25d5d/xijefebaraxaxu.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/52964226621.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061818262780554.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7430c3f3a---mopanarunesegawotoko.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/betilekufitup.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/09v6loviit6kpvja2l660u4q11/pofikufofilegukowasozul.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b772b9462---34250337301.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da4070863---xoletipisinitejupin.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e00445c3---minavifenufatagez.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/najesusebadifejegar.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/750de013dbf253dd57833f229d2f691e/78574449286.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/wojaxufevun.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9460354563---64031605786.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/nijuxosi.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9477d43279107fb3ac2f04bba5190550/47155194713.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 10724 bytes
SHA-256: 53a73f6f39df9d5a32d363c0f1b1a1c75fad83d51fccdd9f463221a17fbd7f2f
font_01_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 18180 bytes
SHA-256: b081c73bcac664a0c405de0b78d6139819ee797183328b914a478665b7dd82e8
font_02_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off0001351d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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