Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a59302ad94d52c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 14:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7529b5213c725283c5d0425c7cca9744 SHA-1: fa12984306096f613f349f791fe01e9734917374 SHA-256: 89a59302ad94d52c04748a9d491d91c54857edcdde3c397fcac5627bfa499ba3
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent to trick users into downloading further stages of malware. The ML classifier also strongly indicated maliciousness.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://patanjali.zohukum.com/ckfinder/userfiles/files/dewewi.pdf In PDF document text
    • http://simoncaulkin.com/images/29378415380.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdf61c3c3---76375881635.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/68466360004.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/jajilozale.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/17264223288.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/pakibefixekowelofefuwaf.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2f64f43e4e07a6c088634154a1b9d2de/9304606575.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ba4c2345f350081cfab29dfa345fe1e4/pekopuwedafogoxewuguj.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/dugalupeb.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/14112409405.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161348aeeb4653---darimagazafidemibogivajaz.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/55236083302.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109130645079598.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/budagukelidenasejul.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/42125730814.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/97bca22500dae8150c6fa2a99faa0eb0/gosibeturije.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/zizesokog.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/wupusiper.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/96742105594.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/61352874506.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/kuxijoxejaxezinidejasava.pdfIn PDF document text
    • http://8njl.com/userfiles/files/wukoj.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/81386330010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wwe+2k+17+5kapkPDF 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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 10044 bytes
SHA-256: bc6aff8a3c10b78156f57f17117ba9db31e07e49cad19761a65fb5b29ef261b0
font_02_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 18312 bytes
SHA-256: a8f3032ea9461427ff13228db9baaa5f18063597e1e86030b220c2f7fe6ac2e2

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