Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb48c30a6c036b9…

MALICIOUS

PDF

118.1 KB Created: 2021-06-29 18:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 156baf63cdafd238e7da20b0367e0595 SHA-1: 1b30b3ef917bfc125997306f024486dea1362db4 SHA-256: efb48c30a6c036b9b6579fcc8ee71622ec7ea1c4c8c12ae2c36e2000f5be823e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of an advance-fee scam and callback phishing lure, as indicated by heuristic firings. It also utilizes compromised CMS upload links for hosting malicious content, suggesting a pattern of leveraging existing infrastructure for distribution. While no scripts were explicitly extracted, the PDF structure and heuristic detections point towards a malicious intent to deceive users into financial loss or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/afadedafb3dd7efa0f5feb8fd9d70806/38507062649.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/kgo6plmmj9av9id8o5jfelmd02/81041838507.pdf
    • https://arendic.cl/files/263852859.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/mulasupi.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f2151abc3b6a4d1af937f417d5b7825e/befuxorofixajusepeke.pdf
    • http://cnmrobotics.com/files/files/10516162473.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/edbf994adbb24643d5ad5a0436ffeec0/zonojoredefuteb.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7021a9f178---56727137274.pdf
    • http://akicgiyim.com/userfiles/file/74278768749.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2740a7eb1---24978064123.pdf
    • http://alkanboya.com/files/file///zowaludidamawizomadarus.pdf
    • http://security-m.jp/tool/images/file/71947117744.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d33f0a292c8---99943643213.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48f89434ee---96764819538.pdf
    • http://fxmeat.com/upload/file/3984081ea16e2564405ae18cbfcd7408.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c8d343f01---16295107832.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fef58ab88a---jiwumiwijisipobazamajux.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/351e2f9ce2f5c7b3c42eac2889b9f648/sukera.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/felonulonitalelat.pdf
    • http://zabradli-znerezu.cz/userfiles/file/kajojewufezotaron.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbf90fec5---73177664081.pdf
    • http://monkey-do.net/userfiles/file/34312133191.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e19a63f95---roros.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/25b5349be0b3805efd204dabe521dc67/lorufoso.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55affe7d9a---98234325699.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pta+question+bank+for+12th+free+download+2020
    • 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_off000169aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x169AA 16792 bytes
font_01_sfnt_off000181bc.bin
ea52812de233077c979426529bdd151d969edd4519113f7003b847d6c17c1a0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x181BC 16932 bytes
font_02_sfnt_off0001ae0e.bin
a539b32b9d58405745823191030789b99bba93a5132146eb93df11a08a181b16
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE0E 11308 bytes