Malicious PDF — malware analysis report

Static analysis result for SHA-256 de637c013b4e1f7b…

MALICIOUS

PDF

91.5 KB Created: 2021-06-30 11:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6bf2612c8305b5f532911832d63e9d1 SHA-1: dfbb06d587a041968f4c9604c8e7ed1449521066 SHA-256: de637c013b4e1f7b1f74614fea71cd986ebb233175a2e4a58822ac3e84c53f6f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/592140a02c329a076e92b81f8f55a00b/21699430021.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7173514c5---mapadiwipukej.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e8f6befa8---44693532284.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddd436027---sekufowonaget.pdf
    • http://pm-ural.com/uploads/files/pasipe.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084fbdbaf038---magenojupalut.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf215eccf8---dujerabotunubep.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/gimbjopel3bqf0bvk2msmnod3e/23748131962.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f932d59cb27200946832d1c898bf7c45/duzipavigakisosoxume.pdf
    • http://hum-lucknow.org/test/fckeditor/file/rubusavufub.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1191ab93f---39533279829.pdf
    • http://dietetyka-24.pl/images/files/demikudozibowinesizufeso.pdf
    • http://www.agenbenangbandung.net/file/77315935482.pdf
    • http://leton.pl/userfiles/file/ladirumap.pdf
    • http://usaoxin.com/userfiles/2021-5/file/roxijipogubusexizifo.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/tufoxebovanejijowobeg.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5397e3f1ed---52925429237.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/28164698249.pdf
    • http://zimaletto.com/uploads/file/70227421000.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7797c5d2f8138b6f159ede4ce7ce1df3/waletiwimagupilovodajizen.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/b6b8deda6f26a4a2e4768e4e1876fb77/bavow.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/dc4e97b5427ff7f09ed50fb3426282bc/22030532494.pdf
    • http://Background
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=capo+chart+for+minor+chords
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 16792 bytes
font_01_sfnt_off00010549.bin
d660ca290ee3c331424661d186a3f81d0a37b57814eb732f1497d6390f63c0db
pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 17288 bytes
font_02_sfnt_off0001328b.bin
9c651d3a3dac42f7883076cf5fb44939f5936670c1f8001de8aafb1f8520b4ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1328B 10740 bytes
font_03_sfnt_off00014b0a.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0A 16140 bytes