Malicious PDF — malware analysis report

Static analysis result for SHA-256 623e28035ca0a07a…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 21:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 403d5b7d2aa987be4c6bee2c185af9f0 SHA-1: 5f0f545abfc0950aa61edbe3753345b5204248ee SHA-256: 623e28035ca0a07a569a60c50ac546958af1562b031e2a20528e003f1349bfbc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://crewmak.ru/uplcv?utm_term=vision+and+method+in+historical+sociology PDF link annotation
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c243815a8a45f5b0392120fb53cf89c1/pidifapon.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/40ba73bdc3b0b02b8c8a9436b1d0e66a/fibinosidafojovula.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607613885f10d---47999261547.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/tenipa.pdfIn PDF document text
    • https://kildevangen.dk/files/gofavulokiwodekaduxuvad.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/2f806671311d401c5a4a16819f5e9c39/17235799621.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/26320958208.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/aef00d790ff25191257da808ded0855b/65987988276.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/68ea73cc77d63a1e97befea8dba6b3e4/19066827264.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/tavenabobi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/r89gog1hibknej2sdq3899as8a/15292091684.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/78724476370.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d3ae45ac1---90931386724.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/sosevidibetedozefubib1620708691.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d52d4572e261e9af23d7e6570778c63a/jotatenejefefo.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/fenigapesobukofina.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bc56f940bb5dd171f88cc53bf232175e/valolivebupu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608553c600f68---57028521371.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0c7381edf---ledos.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/58429884400.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/42989717775.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/60ded0625867ea98739b7022805fe813/gomabisomufozo.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/jimedarewubobetewafexe.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/5n85ksqo1gssav6begfttm2aq8/donivufukadazofedomoferib.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cae020fa4---80919081559.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 10900 bytes
SHA-256: 1aeca133e292fa841f9a375550a53b6dd410bfaeaef3f2b612d13012408f5526
font_02_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 2104 bytes
SHA-256: 514fe131291d6107ba5b4b84ac8f7d6b2ca4b538aa094963c6ae4129e28c4312
font_03_sfnt_off00011a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A55 18796 bytes
SHA-256: 9d7c0dae0acd5d40e45eb1d5fe9817f93bf42e42757b7d086de4df0801c1b52e

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