Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fe247b43927a29…

MALICIOUS

PDF

82.4 KB Created: 2021-08-20 16:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5ae998ffbe4b0e5c18a3ca7dbc55411 SHA-1: e70053730b06bee999e80c5d534af032fda32599 SHA-256: 91fe247b43927a294167085c5cb171e182f10eaedcb6f6abb795092799f1c095
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. These URLs are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://www.urbanwaterways.info/files/vezazoteruvariwamo.pdf In PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/88451078070.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c58b3bafb3f---65499474530.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/78480905055.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/nalolipemo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/7751214119.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/sevomul.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6aae4138---lufusalavinefawumuk.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/sezilunuxipobe.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/48702845562.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89d691254---duzenefirudunorilo.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/pojigexipinegolom.pdfIn PDF document text
    • https://onlinendttraining.net/files/vugakipunemoruzamamu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b412996e3f2---lerexa.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/buvatonew.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/18471213733.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/gorafe.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e6fd5a1657ccbcaf6db0ba0427f3d5e9/92094510248.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/al63q4j03sdjoinabo1jjai008/23469291441.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a58279f00b---pekerofodesajari.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/63119231077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+reset+white+rodgers+1f80-361PDF 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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 16960 bytes
SHA-256: ada6ef8bf440048c1b9981019085f56eb89a6342d69f23aa2595773a1a94a976
font_02_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 11156 bytes
SHA-256: 7c54e6365684953c20997e966c7c4be42bafae2b474f2827dc575045431faef8

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