Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a6abea6f345d3c…

MALICIOUS

PDF

99.9 KB Created: 2021-08-13 21:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 999f18fb91bd73dbd33d9b0b660ef92d SHA-1: 23d37087d69efd9a1247ba3f8768336b8c075e7c SHA-256: 07a6abea6f345d3c02a83cc0ffd66e4ce8f996cb030913d97e91d2384c659d81
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab896c3cc90---gubexabaferijavisebot.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160798b6451d5f---72327639801.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608777f30c4ad---zinagiletasewomutazi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/53c50c8138e5e786044b8d965433e2d9/wexuso.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/zutenasuserakuvejuvikax.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/sutufikiwalumujelebefuta.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210807_AA9E7F168AAE37D9.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e87a203f3e1a205601879ab1b4ce2d4/89221538086.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ptofkjdb30bnmoongtdi82s3sb/56510146591.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/ziwejosalebunoki.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8a99ec0859640fc37de8524a5205b86c/88366173305.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082db5e0e44b---10819356239.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b87d44c06---83923827025.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/pujoru.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909ec342478---62031033379.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/bimudugesuranewatufosa.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/38696613125.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ed2f1227b236c90c791d8059c574df48/jedakok.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cd270e357---33464973949.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6052bd99a8405a801c722b9e07811be8/12533515305.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/653060fa65a0ec4081705aba53aef273/xurolaseletabulejewad.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/91980365812.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/mgphchsi047k82pquapp42skds/dofotegusi.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49ad44dc29---zifuvejarusudemegov.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160930e0eda7a3---73229577580.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/19182820538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dr+poon+metabolic+diet+book+free+pdfPDF 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_off00012155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 17744 bytes
SHA-256: 3cb8ca2cd18277adb6250e5f11b2c5a1449a07a48b26a8ab43ab92c96d3eb89a
font_01_sfnt_off00015027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15027 10848 bytes
SHA-256: 5a037bf3b604b5112834917320fc95d3f2bc67a60a5df5742d581881503efa86
font_02_sfnt_off000168e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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