Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4157b8defb40b8…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 17:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e89765b2f17f9783037a69f6a447f3ff SHA-1: b12bdbe2ffde00837f7ef1d8af73b20eb859120f SHA-256: 7d4157b8defb40b8b289bd5532ebef44d9914de8da33a3a2c1c3607554daedfd
172 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to trick users into downloading further malicious content. The presence of a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bikidi.com/UpFiles/WebEditorFiles/file/75958239795.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4rl7btlh9ss2e5d9cdpdaac150/33692395286.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ed96efb7824d6fc857234cc547b5fd79/66922426822.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8842248e7---zojituro.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f707a5ea9e---84216369250.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ff6c9fb5f---lunugofigomozibij.pdf
    • http://arci-mp.fr/admin/File/jufotuwezopinu.pdf
    • http://shukokai-voves.fr/userfiles/file/dobibituwukaxegan.pdf
    • http://mamnonlittlesun.com/upload/files/44728935836.pdf
    • http://kcde.kr/userfiles/file/38758910579.pdf
    • http://cephedanismani.com/images/pages/file/risisom.pdf
    • https://alatheir.com/atheirwsfiles/file/25101457895.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/b32aba0f49f49afb14d56463ff0c8784/98000893133.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/03cce2b868b5076f16c3f5712980b739/272740321.pdf
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/fineratarisad.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd6bb7310---getipuwowutozag.pdf
    • https://airbays.com/userfiles/file/mafabonafudezakoza.pdf
    • http://ahlhy.com/uploads/file/150749597072.pdf
    • https://tsydesign.com/userfiles/jws/files/tefoxixamolo.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/bowemobapupadilageriw.pdf
    • http://eprdel.cz/userfiles/file/somusalobebujovaxexadefe.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/krilcg81tbs4te3h2158lf82hl/fizap.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/a4fcdea411278f834fb74230891ab4f4/60196690457.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/fuzewu.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a3248023004f2c8c002b0d63fbadedc9/paxubazegubibob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=rca+dissection+during+cardiac+cath
    • 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_off0000f5dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 16792 bytes
font_01_sfnt_off00010def.bin
050beeb846945f0d768304b08c9fbb1f25d47efa003aedfc3f97c06f50ab70f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 17984 bytes
font_02_sfnt_off00013d59.bin
48a45026a09de119f841230800a1b72f3787dd1beafc21e9192b9a501d042358
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D59 10748 bytes