Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3527811c051aa9…

MALICIOUS

PDF

94.7 KB Created: 2021-08-17 08:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdff4c4dc4be732ef15f8fa08dba3a83 SHA-1: 1636bbf2caa45ff5768260ce5d92ac3bce017966 SHA-256: cf3527811c051aa9409112ad81f41a57160779cea1bbcb9d91196a8c514e8a67
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and an advance-fee scam lure, suggesting it aims to trick users into downloading malware. The presence of a 'download button' lure further supports this. The document body is heavily obfuscated and unreadable, but the heuristics and numerous external URLs point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=how+to+create+fake+google+search
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/tupilinatexebuzigur.pdf
    • http://podlahypilat.cz/admin/file/luketebalibutusa.pdf
    • http://megalaserasia.com/upload///22032451004.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d164274e5---18285574464.pdf
    • http://munnarinfo.in/userfiles/file/10991232238.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c879e08719---6710004353.pdf
    • http://jonme.net/ckupload/files/betivinawigupifotamo.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6fbb0c130f11ca4df0e901ceb2454fca/3299973503.pdf
    • https://jobtiara.com/files/files/83285686012.pdf
    • http://iltorg.ru/upload/file/96606563241.pdf
    • https://bucatariizidite.ro/printuri-fi/files/47174772372.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jh31couq08npklhu4eg19mvm36/kovezosedabez.pdf
    • http://tubietelbar.hu/uploadfile/61432919719.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/29l289ehbtkj1lt6u8au9k8pq0/58833132403.pdf
    • http://skomi.ru/img/files/file/85625168518.pdf
    • https://bestcoloringpages.com/userfiles/file/41270921052.pdf
    • http://thegioichuyendong.info/app/webroot/upload/files/26839245038.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/97918853255fa3655e6e2f042ecea246/wifebowovibejubulonopura.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af968d8c12a---31329400892.pdf
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66303360138.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160846b1194ce8---xisupitavikewe.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7985529f1---pebevasazakapegepiv.pdf
    • http://bienchidan.org/uploads/files/xelamarukaxamibojiwudi.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/712dc768c3e9177b92ba5c059d6d2650/37669275110.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161039813cf8e2---94445326611.pdf
    • http://otoozevran.com/resimler/files/70692266443.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010de2.bin
c53c9a498bd1be0ecd7e108263a05eda3afdcce38a8d6d62a069ca6a7f6e41c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE2 17604 bytes
font_01_sfnt_off00013c59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C59 16792 bytes
font_02_sfnt_off00015470.bin
2c4f3eb076208bc5b4f0ba33e448eaf7b7fa79bc69df2187800c889995e22726
pdf-font-stream PDF embedded font (sfnt) at offset 0x15470 10588 bytes