Malicious PDF — malware analysis report

Static analysis result for SHA-256 78de16a9eded204e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 20:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4a47a40d8b38b4611debbc155905c6e SHA-1: e7864d3618ecd77593ba0bb4d39ee48cf377f3b8 SHA-256: 78de16a9eded204e85952ed358c19e2ef2a655ae516b0edb08222a3acf925f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://dovolena-jiznicechy.cz/uploads/bufijabozololavofiti.pdf In PDF document text
    • http://seksdagen.nl/userfiles/file/vuwijaluxisiburaw.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f0211b3fda2---xazororejidupexuru.pdfIn PDF document text
    • http://klaaswester.nl/img/file/mojixel.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0cb74705ea90357ddf59d219bc0ce090/14601277158.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/xilupotorowesodetijax.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36f863586a---50654886993.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/tasomotulaxide.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/13794393400.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/27f6colv2990dsnk1bsh3i8kc5/77326793366.pdfIn PDF document text
    • http://zuche0551.com/upload/file/56308851917.pdfIn PDF document text
    • http://vhktn.at/images/content/files/malulibosapivosekumeke.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/1765274551.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c34a3a9d775---sawasijorenibufaga.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tj37pg45v6ftoege5a031r3i61/67309560433.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/57bb5888c930e6d918411e4829f485e1/90872063346.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/gomepomejofo.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/54382537168.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/71925911997.pdfIn PDF document text
    • https://akvaguru.hu/user/file/26738525668.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/varonunorevewalerizi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/gavarul.pdfIn PDF document text
    • https://cristalensi.com/public/File/jurojil.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/36667870979.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0ccd88cb---libepifugavokanedaj.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06e4814b6a8175de8286bba0b422a036/90377027286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+jpg+to+pdf+converter+crackPDF 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_off0000c47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47B 17136 bytes
SHA-256: 8c8aa020bedd94f9265160db8b38507a3f3ed54131fafff17da25bf56f1ce686
font_01_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 10752 bytes
SHA-256: 19ae27c2959375e1dc90a35d8b15a2ea854869d4f2310e04feef44e20be85836
font_02_sfnt_off00010971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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