Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be34f0e095bf9d1…

MALICIOUS

PDF

88.8 KB Created: 2021-08-10 09:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f4fa5c2c89f6aba57eefab70f697494a SHA-1: c7525c00d541b9e02d67c33818c3703917d9ee0b SHA-256: 0be34f0e095bf9d19ce99636a4c907ea45679d04adcce60d4f6922e45ed240a1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, likely intended to redirect users to malicious sites for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature, and the presence of embedded URLs suggests potential for JavaScript execution to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://cachnhietwin.com/luutru/files/vakukitafipibum.pdf In PDF document text
    • https://soechi.com/userfiles/file/xapike.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/dutiwafiriziwitofu.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/kidatexodutuxaxumivol.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/91070274826.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6rfp5dnl14v0m6515q0pp1u57r/fosiwafimobod.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c93e1f83---43804968557.pdfIn PDF document text
    • https://nasikampung.info/contents//files/42881258534.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/wizoza.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bc8a81cj76qrkbe0knubaaoh14/raxumetexuz.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5hlh8hnanqk8nv6cmd49rtvau3/denodipanazepimotovutogom.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6699f72fbd---gowerobano.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/14899968594.pdfIn macro / runtime command snippet
    • http://status-go.net/gfx/userfiles/files/lapemelalemilanub.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/venodikogizugutad.pdfIn PDF document text
    • https://mavibusiness.it/file/78096518540.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/xulanaxegivobowefoputate.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be87d2c19---68635501784.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/niweti.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/penipitulu.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/pezawirijadawotiva.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4e59be0b---wutujireredudazarilozene.pdfIn PDF document text
    • https://nam.it/wp-In macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+calculate+useful+life+of+asset+as+per+companies+act+2013PDF 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_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 16888 bytes
SHA-256: db481ceb7820743b9029a04aa1ee9f412e1af3f0db222bbd370d2336010a3229
font_01_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 11284 bytes
SHA-256: eb8627f4756264c725d1bbfe1868466f56b856280a3abc81899e4a84457b4176

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