Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b29f58370b5e8d…

MALICIOUS

PDF

166.8 KB Created: 2021-07-02 21:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0ed45b09e53d5a38feae22c64a3995e SHA-1: 03db560b776862655535929c7a72b84d204f3fff SHA-256: f6b29f58370b5e8dc2ced1a6b55385beaaa0204dcca9daf8e57ae9662d0167ee
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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 http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608415a13db1c---46735541180.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b33496f2b---43736630947.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0bf10487---nuroligadudamomodas.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d184271d7---23800623881.pdf
    • http://botosani.ro/img/uploads/file/lurovojo.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087657210e10---zopisunutor.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160db7e8b9fb6c---93222491991.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a548d312d57---8889760304.pdf
    • http://ks-puyuma.com/CKEdit/upload/files/42465855903.pdf
    • http://colorfulmedia.de/fotki/fotki/file/vibugevolikepi.pdf
    • http://hrudolf.com/userfiles/wugopomuz.pdf
    • https://myphambambi.com/webroot/img/files/xabavijovoz.pdf
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/26255540165.pdf
    • http://vce34.ru/attachments/file/35892828799.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079885573026---fijijaxadofagetokijodivow.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/97904bd83f95edc3a31b30b12371d702/92685237537.pdf
    • https://m-isc.com/userfiles/file/62309906952.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/86668106756.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eecf6fb1b---zivunumuvatujavadopewup.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab690d80ff6---fetatawixibokepafiledo.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1e82655051808ec952b2ae71fd581abc/52703633702.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=leona+lewis+you+are+the+reason+mp3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021b0d.bin
d04322c3bfb7bb3e09251e80e5628494e76cd111106533a43b9eeb08d8d703f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x21B0D 19792 bytes
font_01_sfnt_off00024d15.bin
4500707d87fa82eb78c9417c805e00688dce108a3d01d49adc03e806f131f25c
pdf-font-stream PDF embedded font (sfnt) at offset 0x24D15 10944 bytes
font_02_sfnt_off00026655.bin
89cc5bf37e570e4387790a201f6946c5e25d3d3ea279d401cd1df284ce2c7fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x26655 4128 bytes
font_03_sfnt_off000275e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x275E9 16792 bytes