Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c518d9b45d92c06…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 06:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6c7ecd9a72408d41309e9c62bb53618 SHA-1: 4ba81ac1e9f39c193f18bb64229b732bf9c13add SHA-256: 8c518d9b45d92c06931ea6af5f6fc0dbe0c2d21a33983a116287001ab4a836f6
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads or disposable hosting. The ClamAV detection and heuristic firings indicate this PDF is part of a phishing or malware distribution scheme by acting as a link farm to further malicious content. No scripts were extracted, and the document body was unreadable, limiting direct analysis of the lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4361

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://feuerwehr-mittenwalde.de/mediathek/files/dagepoleverevaz.pdf In PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/dejifegaxat.pdfIn PDF document text
    • http://halaljones.com/uploads/files/29130336147.pdfIn PDF document text
    • http://laduses.nl/image/file/tijumikifizodug.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/xigufeboxu.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/kemefowufadisawudegedud.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/56366122156.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/d6gg27qiirspaci52bfakuoo67/jegulebafisataxemopaluxe.pdfIn PDF document text
    • https://hiroyoung.com/data/files/95034337428.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/16658813257.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/495a5114fbbd73be890aeb0c913f4162/83007434304.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/48220619742.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/wudomagifas.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160878747eb343---nimizemusebokezonaxarufu.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/mowuwukawizevore.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e1a39d09---wikoluzipuzidelebexotosow.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/22664320677.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/48066350bc81fb8c3e0586163b29365a/topuz.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9ee1822bd---80814319253.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/719d6069b4c87103bfa7f408843cbe1b/lujezodego.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6fa8cc6b9723b6e8b5bc528a654b556e/xexojisex.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a6df72f2ab087f4c0a48463a9f49bffd/jagizaferuvekugevupetale.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/2561758540.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/robawapegulasevi.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/xapapanejaper.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2883b89ca---pabanubosoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=super+general+portable+ac+manualPDF link annotation
    • 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_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 10772 bytes
SHA-256: cfe88461f0674175fb9be15a86defd630d17d803c595c6e98f0760b22f12099a
font_01_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 17048 bytes
SHA-256: b83e50ee9958e033936bcea20235356893468ba96c6d12433868e1da351b94f4
font_02_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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