Malicious PDF — malware analysis report

Static analysis result for SHA-256 0085f707a1bfee2f…

MALICIOUS

PDF

89.1 KB Created: 2021-07-18 00:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4606ce50b3f7af7e746baaff15b436fe SHA-1: f996709293a0e510dee61c462a7e968202995837 SHA-256: 0085f707a1bfee2f124d7a331f462116850c0609a8ce1459e47b325dbf47b9b3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The embedded URLs and the heuristic firings indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/908c1d0312c5410bf71f214b0985689d/vipunofil.pdf In PDF document text
    • http://huile-de-nigelle.info/userfiles/file/pividilopit.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd79caf2f---doferizexozusirelemixuva.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3fe2e9da3---50883897143.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/vopoxiwun.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/96290507055.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/71194930968.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160752d819d838---nunujesifobizofipo.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/sokakuvizokekegogar.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/07c08bceff55c3cb3a0d240075af4b39/58596456277.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/5009564452.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a029fb15b0---wuzozevevefenonelales.pdfIn PDF document text
    • http://saatyapi.com/upload/ckfinder/files/rizajivopadutofirufigas.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a061741642e---fabimoxolifefapaw.pdfIn PDF document text
    • http://fedime.org/imagenes/pitojimodazubirenekagole.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/zepunabuteru.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/e20etk1ip07c56905mcsn0696q/bisajatositejo.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/podis.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6d42004e85cb7ba7a476f7cd03f11445/77294937156.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/527684509.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/a89kr88oimi4reem3k4q6m9t4p/5035970979.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/22975039764.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b32e253f1a1e2551293f551e339382ee/13833410299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+how+to+use+enchanting+tablePDF 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_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 17612 bytes
SHA-256: 5cccb03e3953d1f71ad56357234bed476328f595dab3e773f143d40b8c76bb42
font_01_sfnt_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 10932 bytes
SHA-256: adb9c0c8c5774f5662897a85caa0d68b675460e1ca5ce22f399653782f7445ff
font_02_sfnt_off00013ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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