Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09b02a7fafbd99f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-09 02:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 030665eef80610ce376c63e63ee74b15 SHA-1: 05db65a14e10fd2659c9deffe0724db9d9a332fd SHA-256: c09b02a7fafbd99fdd867dbf4c00dbf6256bea98c87a954427d786fba7d9a4d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. This suggests the document is designed to lead users to malicious or compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://debcopharma.com/userfiles/file/lutapexobo.pdf In PDF document text
    • http://instalace-charvat.cz/userfiles/file/kofus.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b003a7ca0---49030053185.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/biwevodazuwudufiw.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/girifepuvemirotib.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/71490304414.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/79370931547.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/vineg.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/jibeferotiviwuvukepomazu.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/mamasepo.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/wevokurozemi.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cbaoc9bj5f4oh7pg646ghs24oe/bomakenevegolerukemirid.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd0d4a4ad---37012419012.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/tasupuxunux.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/94599187725.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tonofujos.pdfIn PDF document text
    • http://cpils.com/userfiles/file/92829622579.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/fejefore.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/10789146414.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/paxatemujoma.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161334e9e3842c---73105756176.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/42662645525.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/0c78a609041fca5760793aeae22b80da/sizemafenidetolafif.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/rujakelozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+homepage+widgetsPDF 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_off0000c4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 10860 bytes
SHA-256: e12df73460fdd4b047567332431576e74926ce90f15f4b6c6e7c0292f261025c
font_02_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 16864 bytes
SHA-256: fbd4d0d2a0ab3589f56d479fba23b32d573bceeac54f29b228629923ea00bee6

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