Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fa1f234bd95bbb…

MALICIOUS

PDF

87.8 KB Created: 2021-07-08 08:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01ed73fc96aa83f0650423525c5cd391 SHA-1: 2dc79b7bf2748d3175b9eda1ea41a509a7d16a8c SHA-256: d8fa1f234bd95bbba4d1f167e0d7685a270b2446790c14b3ef47c48affc34fe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/29cfcf766f2df2e7de80a86caebc49d3/4766168757.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e587c723366ecbfddde3f6f1eb55459f/lowomosumudaturutu.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/52849257182.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/35946699559.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e903990e---rexojigimow.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/zizikavuzuf.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/paromokapisolivivud.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/jakuvut.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f07b5ef00---69141350974.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a059d1ef92---kavinutupalegupanir.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd45959f6c---vifogofet.pdfIn PDF document text
    • http://sterkrade.net/ckfinder/userfiles/files/dagefuxuketagibaki.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/rerilivedotabowotip.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1188142fd0---gibinivedomifejefikixe.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/xemerarutitafe.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/eb3d8357998647105a706472cea1d6dc/65801324302.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4f40b21f---13658812563.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/masiro.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/4frcgu53hemcbc0ilq7afoshcj/jiwelegat.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589352b208---24216247659.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/cbb6n42ovcj0ofdl7c3445b4q2/xasakujonip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=free+piano+sheet+music+with+finger+numbersPDF 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_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 11184 bytes
SHA-256: 17d1f166a6bab8fcdf6fccae1c2dbf37e94b8d1f85795914be9179723bf688e3
font_01_sfnt_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 17072 bytes
SHA-256: 4b0b43d3b5818b3752198bf4047f810027edcb459ecf5a90dbed4ec200422de9
font_02_sfnt_off000139b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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