Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f0f4aeec3b15c6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 04:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 251da19887f714014319f1aea65f2661 SHA-1: 1c1ff898af1555e9a1a86e172b215b21ddc59286 SHA-256: f7f0f4aeec3b15c6c408d4475e0c84f338b748e9a113c200449231e070d25361
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also functions as a link farm, directing users to multiple external PDF files hosted on various domains, some of which are flagged as compromised or disposable. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://titibbs.xyz/js/ckfinder/userfiles/files/74811245706.pdf In PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/13896617079.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/80389646266.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/namiresapiko.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/49607073324.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/39814787190.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/satut.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/mitojazonosofajod.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369cb99570e---56432556254.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/kefizepefuzoxizogawapibi.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909090549.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/57462440662.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/33308479131.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/mirojusitipufa.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/52797902482.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qars6poht9702tvedl66pt1rtn/67403484742.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/28905841940.pdfIn PDF document text
    • http://firegallery.ru/img/upload/80813349203.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/16009113691.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/38020166616.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/zogofefokemanezikuv.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/59933605394.pdfIn PDF document text
    • https://maisonforville.be/documents/file/34814152941.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/viwanufew.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6beebdd1c84a4e5359ba8068ca63b6e8/xepur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=to+do+list+printable+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_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 10596 bytes
SHA-256: a03eefd5a9ea4225c215ac926118be496a7f1df7914cc7cba35e4f284c490f21
font_02_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 17184 bytes
SHA-256: 8d3b4470d93700e31f49658de6c2aee48a4e042dff64f5c7913dcd6eeacc575e

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