Malicious PDF — malware analysis report

Static analysis result for SHA-256 8841012e7696023e…

MALICIOUS

PDF

89.5 KB Created: 2021-07-01 09:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8e65aa6c0ab0175afa67c5312432bb5 SHA-1: 15f579dedbb43c096d5ec424e51435fad0a2b640 SHA-256: 8841012e7696023e8f9cdbb6046857784240c90b0af9a53a76bf02b4d40f8d66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://ciskmv.com/css/file/3680130068.pdf
    • https://ivanda-commerce.hr/userfiles/file/gitejibezadojorunivasuji.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/36173806248.pdf
    • https://vinadesigndanang.vn/uploads/image/files/24422544003.pdf
    • https://fentesmakina.com/paket/upload/files/zavuwuzunawe.pdf
    • http://begemot-rus.com/uploadfiles/file/2021051514285973499.pdf
    • http://grandp.ru/userfiles/file/21391193629.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/32a517a9e319935d0963197386107d37/52646330241.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fed4d5c47e---89519015268.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e93d1f8ac507f2502186ab880a12edb6/65519260831.pdf
    • http://aiaato.com/FileData/ckfinder/files/20210615_7C57C5031654F831.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be538e1cb72---96332425465.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/vamq8fmh4ru1bo6bd74cefuuon/43419022902.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/726f1ca91ec82707773d0ccf4870f2e2/32824035451.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8264f554cd73956d9cae0fad39f4eecc/598120391.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/bogetimefejedidisomu.pdf
    • https://weddingitaly.jp/images/file/61450282250.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608226c3ddeda---61325220292.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c669763ef4---kaxozonirakubonis.pdf
    • http://guowangcable.com/d/files/52700676369.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e7726e8c83b28efb87801aacdfb7f0a0/nijosesabiforapesogakazup.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d7bc34893---77625112380.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/vugorafulefuki.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8urppvstmrmn4k7772f2dp6hp7/maduguwofadizaj.pdf
    • http://marthomaiticherukole.com/userfiles/file/pivenunenavemi.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d96a139f9---ganurogogilubuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+spin+coin+master+online
    • 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_off0000fda3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 16792 bytes
font_01_sfnt_off000115b5.bin
2c76ee5f87f61c688cf44a6051e473b8f3f4844462533072feaf84e843dcece7
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B5 16556 bytes
font_02_sfnt_off000140d3.bin
87d47bb8ab46fff3f14a5281049748fe30104a8a52b39a77c3e2875e3561c5a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x140D3 10512 bytes