Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f427471049b7531…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 23:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61870938dfb066c91024dab58bf52bbc SHA-1: eae61970d25d456bb579b1440e8a229b07030771 SHA-256: 1f427471049b75311364cb38ae92921a803709c2c9a57fd5c48231a9ed057370
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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The embedded URLs and the overall structure suggest an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/31a2d0286162e135f9580aa41f93b478/17122954364.pdf In PDF document text
    • https://shidoremicrosys.com/media/sokatutavetuteburumido.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9bbdc1ff4---saxotipujezorajizajeki.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/voluzab.pdfIn PDF document text
    • http://uci.ir/userfiles/file/finazufekinadu.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/pupewifuwewigo.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7ebf07d3408ca13551cdc67f7c5329b2/radopaluvopebopodiz.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607792e7068c3---bawaveruraj.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/magibizivozele.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/01f46e811bd8ec81e5b0a6680d620f36/52765118360.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6fc322c828eb508f78c5122523d2113e/18321856303.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/lalapugalologa.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/piwuxamax.pdfIn PDF document text
    • https://campermagazine.tv/public/file/guresamefawuxiwew.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/11851179027.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60446ac67---49614690734.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/wijifa.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/85411273566.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c0d190acd---60330092003.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f11b7bd3dbae2bee0acc5bade87b543e/nugubifonugadabilez.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/8052186595.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/kivubadewedezotebe.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/38536101046.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/50025229465.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202194160396792.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/38635270088.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/48482803612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=unit+conversion+worksheet+with+answersPDF 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_off0000c8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 17728 bytes
SHA-256: ed6bbc8e76c6f85e997b2f534f8bf340cd4081db45d43837732576f2567a6ae3
font_01_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 10532 bytes
SHA-256: aab565814ac39c4b5aacda42d8b3e67a41ccf3d1cebc89540f220125804c30ea
font_02_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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