Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31209dd368fc45c…

MALICIOUS

PDF

98.2 KB Created: 2021-09-02 10:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edd25480d844d9f95508b61e4d9a35f2 SHA-1: ff4203c1d247d8824b4c42ade1e6f4905240102d SHA-256: f31209dd368fc45c66c7ec21077792767eed3b51ac31211598cd7c5ef41cf807
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of these links strongly suggests a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19854226881.pdf In PDF document text
    • http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/tidefozufoxewezulegex.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ce67f93d738e3fc9b6c6a52c4364a24d/10045413354.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/96311363530.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f7e0902da0---gisuzijijosobo.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/76312140505.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161181f92af500---jesomuxusetenozenebiz.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/wetewuripam.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8472969ae---tekujavedonelowejogapebax.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/61191244656.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160fe09ff8a8df---gopaxitejaribisebosa.pdfIn PDF document text
    • http://szcftz.com/upload/18200771221.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/zigusotakavuluwowavebezo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c272c4a068---xezigapokobesexevabegaxem.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/38371920086.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/gogekudubewadopage.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/v60f8fo2r64r08bjg6f1n3704v/3876227595.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/64df4a32edf1e502d86456f9e8fde00c/67622769315.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/gafexewogujanonilo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/d83af7d8fa6f271ad17a4a9acf38a60b/51056821383.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/46486371896.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/66121176165.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/wokid.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/wabesojesinipetukazinapa.pdfIn PDF document text
    • http://prestopc.it/upload/file/50091238371.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/7802622890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=perseus+and+the+gorgon%27s+headPDF 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_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1C 20836 bytes
SHA-256: 1d0c329ba62ba43be36cf1498f4e9f648b5b1e7a1b5a1ecd230781ed4b46328e
font_02_sfnt_off0001633e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1633E 10524 bytes
SHA-256: e6024a71b34124b678605ba23d74b9351b86450a3372de7b73a089b4306ed3d8

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