Malicious PDF — malware analysis report

Static analysis result for SHA-256 927bc1ef170b905e…

MALICIOUS

PDF

85.6 KB Created: 2021-08-12 22:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 27343456a1c8a9a174dc8e17feeff820 SHA-1: 3cc5b6ca6e970212de9919b493477262299ceabc SHA-256: 927bc1ef170b905e8694a868d9a90efd517ccc871d9d60099982ff15e05a1801
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous disposable hosting sites, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. While no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to trick users into downloading and decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://daonshop.com/files/fckeditor/file/5722785418.pdf In PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/90382085380.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/dupoma.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/84a6v1pvkqc0l2pomap7679n07/81272078232.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/79724432424.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608addaf3f279---wemuviv.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/20406651634.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/41116759262.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792c836245e---suvesorovubosaduvagidaraf.pdfIn PDF document text
    • http://newo.ru/files/files/27188645153.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/48858852419.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/kuvevudijevagowavuxiwiv.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/72977388158.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/bubetazinifazar.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16078b66803457---12032587322.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/sonopiwaxe.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97485204f1---73218042409.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/68022480531.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/47415364965.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/kideten.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/83834984098.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2b407659fef514201ced34f3c52edaa1/95482499111.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/1620101300166.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/lv4mbcst2ji9uvt6lo6lo3v0v6/53186914906.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lokinegemet.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/10914821094.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ddaaa33ad5cee734f6dfbb470a587350/xiwolemivujulekonewageliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+divorce+certificate+australiaPDF 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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 10792 bytes
SHA-256: 65853a60236382fde754dd85c19155b1e67a8de518f512b92fd00e0622bc4ec2
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 16956 bytes
SHA-256: 8f9b476bc92ce04105ffb5cc8fb0fe5dde6ab4f4a004d9047f014c85e4ced6f7