Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e62c59947e80423…

MALICIOUS

PDF

80.2 KB Created: 2021-08-30 14:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86a69dbd5fe9636269b4ecf95329fd3a SHA-1: 509e6d4e2ca9849a0ea49dc68bc08d1bc0400361 SHA-256: 9e62c59947e80423e9cc0d583d13fcdcb9b6997bdeee07a2cda683c2b82075e9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or SEO poisoning campaign. No scripts were extracted, but the document structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://ymy-tea.tw/upload/files/43049825533.pdf In PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/klqfd8kd2nnk4ba5vau4qqu0e7/bezaruruvi.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b56340f0036---8330684614.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/nivimapitix.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/godododujafizanilej.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac55da5dc3fd50f9935fb5b601122f28/kekelukolumujawivevagif.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/badelafakekuzopi.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/71793066187.pdfIn PDF document text
    • http://ergakiland.ru/files/files/45509540122.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/jirulu.pdfIn PDF document text
    • http://marketingnews.fr/images/file/79681756515.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/femafadalowere.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/nowetanivozofuxema.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607321ccce308---87153897275.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hvhqo3of42u6pp29qan3hftkf6/41257981585.pdfIn PDF document text
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/6964110653.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/f9mslrciru7jtkpt9ts3g5ifph/gokojemuvopurowiwufesug.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/18a168a9c47c328e5064112fc4cfc917/bomepezedisaponura.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/31772551909.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160755a245e3fb---lozibigimi.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/zuwetajo.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/vijuposukonoli.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/noraridujig.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/0cb8af8ebf1029a39585856e576dfc7c/52633572732.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddef59b1fb---64054531470.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f23d6fc03d034a037589b9b6e49d1715/20758380427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=epidural+for+rib+fracturesPDF 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_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 16328 bytes
SHA-256: fc16f74ff6915db1d77c316d49a89aab1255984bc26d47c3c00bdf08d0490bea
font_02_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 10732 bytes
SHA-256: 886e4a3ccf9ba049e0a67cb82a58a00fa86aeedf2e97b0eae5648c6722f2a36d

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