Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbb0d83a1f5b1a1…

MALICIOUS

PDF

75.3 KB Created: 2021-07-21 06:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ef5e7a619a71abcdb535e8e98aa0233 SHA-1: 12603912908b9c77cb779d76ff90e26cff29621e SHA-256: 1bbb0d83a1f5b1a1481f6ebbbb4cfa84243018499ac43d2a689a32567ca8ca03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this, as they likely serve as redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160771da483039---89134469401.pdf In PDF document text
    • http://atut-biuro.com/uploaded/file/zonovutiluranutuzutopa.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/kuseferojelizukilopiz.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/b0f2fac73eaf87e98aedbb93184fa161/58472840569.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/7b6d500ce7460493bb2b61dab3ed8afa/wujiridalibusotawodojob.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/vizorotujoverisuxodug.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/pegutemaretamifitoguzek.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/29613029858.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/86732283418.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/v1pc0pu030f8fp83a7th738583/soxolodarabulidevivadoba.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a068e419b4---34111833144.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/kavosebafuzel.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4bec739d8---bodetuziwujazuku.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/ketafajapuwosikubezekixe.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/59331824832.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210503003734_1459336813.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/xevajebitumepemoxeje.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e70a3102c---silonotigikafewinoniti.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/71487487360a4f1bf69bca.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d646fe9955---4469099523.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f1a2e8f742031140380ee0d0611369b4/48919602626.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44a1fac0db---35965885478.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608774b8c3caa---tonetofima.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/a77ca2499860dcbe3496dd87475516d1/50632725877.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/2988107685.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/8306214009a6ba457d59d35169dd03bb/62770808905.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pum1h8hl472btm1kqk5njsn6rb/63793951597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=whose+number+is+this+or+who%27s+number+is+thisPDF link annotation
    • 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_off0000c4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D5 15768 bytes
SHA-256: 5b1ac4dbbc800b54bcda13f9395a0ae28b319bc5310e3801f326260f09d4f121
font_01_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 10520 bytes
SHA-256: bb16425d53ff6a608c917dcd20e146160dcf9d1fe5f9d8113c730fc5618ebcf5

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