Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95da66b818734d5…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 05:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a467efed2b711c9c7324882373649d3 SHA-1: 16805eb2954cbb43d75d27d35225542b2393ce18 SHA-256: f95da66b818734d51a4f38086b793b7ba8c5c16df1dd5a21908aa9cda726184c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. This suggests a phishing or SEO poisoning campaign where the ultimate goal is to lure users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hong-tour.com/FileData/ckfinder/files/20210906_F3261C0A565190D3.pdf In PDF document text
    • http://eastwoodfamily.net/userimages/69642416591.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/50696237739.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/15833411845.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/paxovanida.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/50158717783.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/74794601355.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/27319870526.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5af4aff6---6339341598.pdfIn PDF document text
    • http://agmapure.com/upload/files/70510946515.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3b7b3f05---senimejurazabored.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/mulovewaredagavav.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/682v7qngp86jenrg549vrbul3h/12540241467.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/menisa.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/puvebiv.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210905132059.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0435750001630599904.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/90960245213.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613895068f30b---41536108477.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/58815203721.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3fe4513287f1b1ac2d5308055409a87b/41998502998.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8fd39gmh7ltco98uun2i1oaef8/65261481659.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/63977787091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+long+can+fried+chicken+be+left+outPDF 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_off0000e63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 17612 bytes
SHA-256: ed78571142ccc0ccd5279493e75ffea1658794f6750efb87fa409d15710ad1d6
font_01_sfnt_off00011396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 10996 bytes
SHA-256: fca8b7eb5b329e508a5989110653a47e5661302afadccaa67ba3054c6a92c5af
font_02_sfnt_off00012ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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