Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc386ca9f19023fc…

MALICIOUS

PDF

68.1 KB Created: 2021-09-28 05:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f575482e7147f9520ab9e85b232da4a SHA-1: f7cff265a14b00c2726c0044549d4e78c40c6b62 SHA-256: bc386ca9f19023fce278ada7a9977fc582a062512ee239d1c69e135d03af367c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The 'PDF_IMAGE_LURE' heuristic indicates it's likely an image-based document designed to trick users into clicking a link, which aligns with a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=ustream+on+android PDF link annotation
    • http://zamgph.com/uploads/file/14190135480.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329f5bc5dd8---wugaf.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/lidoboxuripuzoposozemoje.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/bubitus.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/90292042714.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8e87006f---99441299487.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210924003848.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/voxasolobuwejudafola.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/48297275025.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/powulolu.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109262050491363.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/juxosupiwulolazifafuloxu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f76e310f18dmg11jacq6osfu35/sawemonas.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85184e8eb---1766171781.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/61006590304.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/fukogopamiletudufogim.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/62572241577.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/jlimcun61i1fv3okn6n8dj5889/93775603872.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/01b238fdb6611a46e014f8ec44e66a8d/datanefajof.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/kimafoxexagag.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210906233000.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/65864922425.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/39764110355.pdfIn PDF document text
    • http://freewest.at/12110844320.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/limonilebenosux.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_off0000b05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 13552 bytes
SHA-256: 27d2a1dcb29c2b98c139c31d62dac706108b3e059b9cfd2e99780f03179bfb4e
font_02_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 10368 bytes
SHA-256: ef1d87f91370ff602f3dfb3dfa423fd1c332535b4f4479d6d5eac338887a3872

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