Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff0170c8cf95f4d…

MALICIOUS

PDF

99.3 KB Created: 2021-08-03 16:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2a2d9848c943b2ab82dc30061fd08c6 SHA-1: a51e61a8c24042a6fc189f42a32a1474f78759fc SHA-256: 0ff0170c8cf95f4d8e850295f6e344575423733ccf149bcd087942cb27bb39a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate an attempt to lead the user to a phishing or malware distribution page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://allytemp.ru/uplcv?utm_term=two+step+inequality+word+problems+worksheet+answer+key PDF link annotation
    • http://ed-web.cz/userfilesfile/luvapojowazikit.pdfIn PDF document text
    • https://baongochoa.com/upload/file/32019387745.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/netigudugajesojed.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/13438800768.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0551d2b95---fewinewofenitekep.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/86073585379.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/39c5154377e46c6a9341686c2347c7ea/zibivivojug.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/rirorewesezepiligisup.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16106eb55ba7bc---wosubel.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/clfsnd5lesvrpf642tb6r1f6s4/dazeliveletoxifak.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/zidopiwozolup.pdfIn PDF document text
    • http://rubensova16.cz/files/file/gulivokojol.pdfIn PDF document text
    • https://sambelteri.com/contents//files/46097383430.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/senaxe.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/82720032137.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31cfa1da8d---49618228062.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e66f2f797---18319428056.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/gomijiruvuvogodaxuduno.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4fbc5eb678c14fded2adc2ba8c05c8cb/82956273312.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/fukevek.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/netowufepapetagekabofa.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/185ljg7jkq2pi04kqabp9eeb3n/sebigokezoxom.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160802bd2b50c6---wevejesepi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4e16a2e5b---56672564567.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_off00011906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 19260 bytes
SHA-256: b25e0c991fbc7514e0f43f26645150ef30da12fd3bd451f8111e15809c46f63a
font_01_sfnt_off00014c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A4 11300 bytes
SHA-256: cb78c98e9f69722d5dfddf3736bfeff174ec28e7dae3ce7e97b194796654977e

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