Malicious PDF — malware analysis report

Static analysis result for SHA-256 22597f81194d410e…

MALICIOUS

PDF

118.9 KB Created: 2021-07-02 17:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b89a4c7887bf6b12b53a8dd5a91b5dd2 SHA-1: cd754ed60e070c08c42c097f2c514be82ff370a7 SHA-256: 22597f81194d410e5e1f4c301e97b517dc51eaabc7f5be0e59ee43fa27d87c13
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised websites, likely intended to lure users into clicking and potentially downloading further malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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://drafthe.ru/uplcv?utm_term=what+kind+of+grass+do+cows+eat
    • http://sattosushi.com/uploads/files/49746706505.pdf
    • http://moonlightmontessori.com/upload/files/15107497894.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/089dsf1r1tkfmg48a05s6mmgm0/72931509081.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2eab94d30529ec006beceab1db7831ad/61864986273.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/52ceeb870d2bc7e435ed91ee1dcf15c8/89958169279.pdf
    • http://kapelski.pl/userfiles/file/ponowimupikafisuzunuleva.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/607db81acd77e53494429d5a9700e378/97844473662.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/9904332448.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eaaaf2c8---dudidosukujinowaja.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160907700f3edc---66361991677.pdf
    • http://tootingtaxi.com/survey/userfiles/files/kutilobigabovabalefuz.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607219aa769c2---9464706801.pdf
    • http://yachtandgulet.com/userfiles/file/3846305036.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/9k5ncr25gd06up1gs824ajj010/11511911409.pdf
    • https://ancoraeducacion.com/images/tezumak.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa62b2f427---22739466989.pdf
    • http://copy2d.com/ftp/image/file/72141788997.pdf
    • https://csn-alliance.com/data/files/vuxefofilopisaj.pdf
    • http://hncastlecable.com/d/files/92906002403.pdf
    • http://onlineticketreview.com/images/file/xajavet.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/5t4cc4mdc1hpg6qq4rhdeas4l6/zator.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/23039990373.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/rs9le291m0fd57i1jrde3k85ho/gewezuxifirurir.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63fcb98af---91431726781.pdf
    • https://fertilizerproductionprocess.com/d/files/55049053222.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/u7b0hgqkvdvnndnqjb4a15vpi8/terutife.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607618e0941a7---depadutisubewojezat.pdf
    • https://global-product.org/CKEdit/upload/files/jetosozojepemugamavog.pdf
    • 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_off00016b76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B76 16792 bytes
font_01_sfnt_off0001838d.bin
9cddb84d0b76b114637a06aedfbf9e931c8aaf308f752e4a6a88d20f4792e5e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1838D 10880 bytes
font_02_sfnt_off00019c8a.bin
231b7a537d20dc1c7f34f7ac8a7f8237ced4862109f17499d799666b3cf602dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x19C8A 18128 bytes