Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa30015aeef31e8…

MALICIOUS

PDF

71.1 KB Created: 2021-09-10 13:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c78a8653bb29f054d697d9a804cb250e SHA-1: df52ef037c4d596ec9c82786a55c05d61b55cb48 SHA-256: 6aa30015aeef31e8ffb1ede678d13c62d3f6a6e1c10426e772634d921f24d716
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tapuionoticias.com/ckfinder/files/namamimokotadure.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4f230d0a---midoparita.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/80460528708.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/65411843773.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/65356714370.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2dca30d6---kuxekuvuvufekidajag.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m9h52454q30bmf6e6sgjh0sm47/dikezorinemikakigufanel.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/xetikubo.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/9929899789.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/runewu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/72673397353.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/jezipoduzogapukubigo.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/wejawikizonevajefipi.pdfIn PDF document text
    • http://otczenacts.com/media/files/nawixapovijetipe.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/rilefiloxubasuniwavaganim.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/90229441879.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/nixorew.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/98799804822.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/26712778265.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/84841378327.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109050653435226.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921f323eb6---gelisetefebuwuraxud.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/16020022972.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1027820051613886d89a348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sad+shayari+photoPDF 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_off0000b1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F4 10396 bytes
SHA-256: 4de3e3f57658047fd9d103b6227e411e580368682671b8f8186dac6b17a70987
font_01_sfnt_off0000c990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 17552 bytes
SHA-256: 1588ddf589d8cc2fb0f32e21dafc77dd3ff1aae19b0b7b6f6ceb4c099c53f04c
font_02_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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