Malicious PDF — malware analysis report

Static analysis result for SHA-256 077e39fc715ed980…

MALICIOUS

PDF

79.4 KB Created: 2021-08-29 20:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: c8e13e14a2157721d2da5c55fc76aee7 SHA-1: 1c5fb5680097a91e0ac11bde80bb1ee98d07b8fb SHA-256: 077e39fc715ed980751b134127dcf2e96a8838d37f4cca60d4294f4df718dc04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abce0f50ab8---vilalu.pdf In PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49eafbff6d---38454008736.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/mifuruzat.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de8840be2d5---tokujovatas.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/mepizareruxoriwid.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/41625369840.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/20411060149.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c653b8d8583---zasozisojepegupabezabej.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/t16l46t2322b02nn3eeubva023/77402971956.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d2b9d60473f06bf4747df87c93d832db/vazigakana.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/110pk3h2vpo9j6leh69fga1h08/32994439342.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/rokudegesuvubijabepivi.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///kapadazamopawudagof.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/xixifapotodevevivojetidu.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd93e90ee2---69618506120.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/10760124314.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/83303506189.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5rfcsjmmps7878aoe0538c63bv/30691056150.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607270f58f8af---jetusizesalekonadawi.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/sivijijezokolorexu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/36998137439.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/71636561212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=you+only+get+to+do+it+once+lyricsPDF 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_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 17412 bytes
SHA-256: e055dcdeffb58ed2ad779ed1ce1d956102068bf671ad75b04ea0cc8efd6906c8
font_01_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 10580 bytes
SHA-256: dbd53695f17fee4b5732327b5a66454274c52974157cd5b7f73b7f854166b0ca
font_02_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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