Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7877e3fe69d267…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 11:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d2c43a210eb36056f8395726252927d SHA-1: eaeae0ff0efdb933c41a45d9539a7168d9a5b8ba SHA-256: bc7877e3fe69d267f4e580e9f0cce06c04b58cc7593eb3f25579983858dce339
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for second-stage malware. Although no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://atek-ent.com/upload/file/tazevatamuxumuvesutafa.pdf In PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087367acddb8---30871429714.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/1927444564.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/77723273068.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/93d10501ab8ba7c74c1a20b393087c5d/bufotafipares.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/48962783491.pdfIn PDF document text
    • https://bataretak.com/img/files/file/95732851576.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16121852f3d1eb---16431906330.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16077eca6924bd---17019472483.pdfIn PDF document text
    • http://muszempilla.com/files/file/30223474402.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/48725007812.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1203b18ad31b9e4a7b5dce4e0929c8ee/xeduwogakoxo.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/2828c860626aa3910227ad51e0c31974/74005978329.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607329194b0a7---rekamo.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/xonewemifitorobob.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/20078255309.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/tetarenulekipelafolifejeb.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/radanowuxabidi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8315cc551e6ca51aef89348f584ab32a/wakelofidipufagulofawumin.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/lixasojolixidexaw.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/74c362b3a50390dcdded79bf311416d8/21741921947.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ff4506025---sitefewoxawupexase.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/330dd8271dfe19de2a4b3b9b5b713d66/soxupixefavos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=happy+anniversary+brother+in+law+and+sister+in+law+imagesPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/225bd408854b6e914cd80388db357269/fosasinugewaxopab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 11236 bytes
SHA-256: 4ab61650e476b312be68793c1d7abf7862f33fa7dfe82c1e879d55ee44b0d855
font_02_sfnt_off00011ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA3 19544 bytes
SHA-256: 98c2f2ae5858a50799604f6a43927fa680b6bd4322e6d67c1e67d4ca717291c9

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