Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab8dc2df3cee3ec…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 07:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5142bb22510db6df0643854abde08ee SHA-1: d01da20569b0f149540cbc8c9c576cfe40512491 SHA-256: 7ab8dc2df3cee3ecba02d20d8213b2c7e3a67dfd8bd4eb0c88bee85b34b0b949
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to create a network of deceptive links. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=why+is+my+phone+memory+full+android PDF link annotation
    • https://gibidesign.com/fckfiles/file/15376578247.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ffffbb110f1cec34a33306c0472b259f/7911002275.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613cee1c2fc15---giduxilukamawovatuwiki.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/betomagoled.pdfIn PDF document text
    • http://akademibt.com/resimler/files/pebanezixogelisov.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/vawanowiluf.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/65027120212.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d54896d5b89c82befb71f2989060436b/fuxawukep.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/64352569697.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/77208465556.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/vexuvezabefakites.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210904102912.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/36396610283.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/01v0ek39rtegona73eaqe3bsi8/29943326541.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/mepivajav.pdfIn PDF document text
    • http://bronia.org/userfiles/file/17273893804.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/q98te2k2bse7hqfeaqc1n1v1c4/88524370204.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/biragamuvemulesagoxizuru.pdfIn PDF document text
    • https://betsin.org/userfiles/files/38711603422.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/jezimodak.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/pesujimifuser.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/gotodamopeb.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/92842194835.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/37830344999.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/virovaxitalukemev.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_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 17832 bytes
SHA-256: 65f2ef24b6b98f1e58f463a379a3a282512989be6f746d89e7f2a7197541ac99
font_02_sfnt_off00013127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13127 10872 bytes
SHA-256: 4c0fc4f2085188a3ee8042381f7c8546be94aa587eb2c9589acd8031dc45fb4a

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