Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca9caad7491ba27…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 22:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b837ae746ff303d410ae875511223105 SHA-1: 978d4e32e683974e229e14ea17796fa1347dbb4d SHA-256: 4ca9caad7491ba2704479869283e79c8dd16e38fa5bbff89bf0f945a535e4d3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the document is intended to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://cructi.ru/uplcv?utm_term=edit+pdf+online+tool+free PDF link annotation
    • http://karpatskiles.ru/store/file/34145956938.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e1am4r0s0ralljq269lhb150m4/vofexa.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/53861c7291730866e53f502fe19edcc9/89259499419.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/85016551682.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/0os218en6s77tdlv4ug27qnkd4/dojajiruwurokiragosoban.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1cf8872a106be311ab453ccce45ae4d8/jinaro.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/038be827dcf18258fd9c0e9cae8c2c3c/72740029084.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc6cb9756---povaxuror.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/58130144824.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gutapajuvidiruzemor.pdfIn PDF document text
    • http://come2menorca.com/images/file/90225245897.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b845ff1070e---guxagalaxaxubonosa.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/volovoxi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/j6gtbdgeohdpad0ugvj8qevspp/ponipavejikunukavuladi.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/26511559084.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76520eb288f0cd290cd3cb39bf7d3aa5/tadosaroxowojemaveniwatej.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/66590434722.pdfIn PDF document text
    • https://coil.hk/upload/files/fivezofevikizudib.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/85055715864.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/juwiwolorununef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53edec8b1c---lijotiludiwasobo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f335e2e06---timokimolazowi.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/xegapurenadigebanusesixe.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/abcd536fd189d651071d3d96a144946a/37499872340.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/misoga.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/kutebekerajelifazuxixufig.pdfIn PDF document text
    • 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_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 10144 bytes
SHA-256: c22d5740597d9fdb95c95a7a98ee4d972f22185497d9491e36983a12507403f4
font_02_sfnt_off00013542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13542 18056 bytes
SHA-256: c8e012f8a5869d0208ad2fb065ca7da06f8b980c1e9bfc3002d86eb60fa2e0c2

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