Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a9dcd9e3e15d20…

MALICIOUS

PDF

124.4 KB Created: 2021-06-19 00:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7188609e4d966c5b8988e488bdc7780 SHA-1: 82a79bd10877219a254c943d134abb4c09716926 SHA-256: c4a9dcd9e3e15d20f3d39df5f990bdadbabdaebfcd12dbbb8fb74acb21d72efe
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of an advance-fee scam, using language related to lotteries, prizes, and parcel delivery to entice the user. It contains numerous links to external PDFs hosted on various websites, some of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://rentaruedas.com/files/others/xufaxemosaliranurad.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe7826281---18775467386.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/59702489754.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609877b5b6388---vabuzadugilin.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda26b03c9---32781447164.pdf
    • https://aawyx.com/sites/default/imageuser/file/12651656872.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/538df65106fca2ebd0c5e3f9e5210f98/rikobulupitag.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160927e2fa443d---2180321145.pdf
    • https://mdteam.se/ckfinder/userfiles/files/burubedezewuzejepagani.pdf
    • http://bularz-auto.pl/images/userfiles/file/xegizobosibukaxemo.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waxazonuja.pdf
    • http://selfmadefilms.nl/userfiles/files/12647697890.pdf
    • http://maasmartcity.com/userfiles/file/59979276223.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32541f4e3---48054879882.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7d2a2st6o1bp0ge6gonn6o1sig/neramuvamevomobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=rowdy+rathore+sub+indo
    • 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://scripts.sil.org/OFL
    • 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_off0001809e.bin
f1d32eb3eeabdff7362d0ba7f8a4989cfe52120e421500e892ebc47330fedfa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1809E 5224 bytes
font_01_sfnt_off00019270.bin
aedf63ab6348e8e65482f47422adcb71b20a780dc6b584c54309d5b86708c089
pdf-font-stream PDF embedded font (sfnt) at offset 0x19270 13536 bytes
font_02_sfnt_off0001bc9d.bin
cf69fea22c2b7f2ce5e8afd254dc5587ebb1626cf73efd068535fd5623c38018
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC9D 17292 bytes
font_03_sfnt_off0001d5ee.bin
72c06bac131cf3b35dfa3325ee4832f27784d7ef8b8ef7018f8715f8ff6c8396
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5EE 3168 bytes