Malicious PDF — malware analysis report

Static analysis result for SHA-256 520678700d7819cc…

MALICIOUS

PDF

92.1 KB Created: 2021-09-17 14:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b78b8dda72877c3f672a21eaf3a86061 SHA-1: e0d8b6f426e012294bd6c2a0d3880c1a5830b0a5 SHA-256: 520678700d7819ccf6b491a70ac18b96a5497e128124606691e562d683c80981
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to external sites. Several heuristics indicate this is a link farm on disposable or compromised hosting, with one heuristic specifically flagging it as a phishing trojan. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be redirecting users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://oishisushigd.com/uploads/files/jefutufebotakawurexuxu.pdf In PDF document text
    • https://farmacieitaliane.com/documenti/file/mexajedozekodokuxure.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/rogem.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a1dbaaed2---putubidanujamudid.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/79263841834.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445b75183b3---64732239312.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/28605673821.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/mafalirujamixesoruzixana.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/laxepepazuku.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/sabaxerawofogotalibe.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/17371551326.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/67750087302.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/96891804188.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/51850793691.pdfIn PDF document text
    • http://attlas.center/userfiles/file/negemewap.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e50b02a93b18908a94c07ee71c79270e/38273174959.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4f527c2a7---vawuvit.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109170521185784.pdfIn PDF document text
    • http://nature-revive.org/files/file/12443459448.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/74211796981.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/wifuba.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2db40976---xibuvolole.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/tekasepobusaxatirufexemem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=iphone+spoofing+app+pokemon+goPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6E 18148 bytes
SHA-256: d04ed304fd12ac64743d1b18a57bb1751ecb86d3891e08d4915043a93b946183
font_02_sfnt_off00014aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAB 10604 bytes
SHA-256: bb3db7289198612cb07170edcba741b0bbe01256711c7794ab6eabb16815a959

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