Malicious PDF — malware analysis report

Static analysis result for SHA-256 987672e2adea23f7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 11:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2dce77a2932389b74618af61ce32d3a SHA-1: 72ff4858b5d7f7cce78a345edc0588c74dafbaf2 SHA-256: 987672e2adea23f73fcf075d15666d44611de2ceba0f6e7b22f9a1957c88426f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=cheat+roblox+muscle+legends PDF link annotation
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614202cbf1930---66499925585.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/47638625154.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/kuxawimibewope.pdfIn PDF document text
    • http://ge-mak.com/files/94695593049.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/54432846648.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/16263454809.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7ladpojut3a8etfavdb80jtgd6/22685850344.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/xunuromasi.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/32008160760.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161427aa080c65---zewameseruzasobefigavo.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/kadamajav.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/guropomiviwetexikamerafot.pdfIn PDF document text
    • https://pecsikult.hu/files/file/82460227286.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142519d1dabb---pegepevorifiwaxofafo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349fd9b6124---kosaribozafesawuroduxak.pdfIn PDF document text
    • http://24cvety.ru/upload/files/bukepusozetotud.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/61495993231.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/fijixedumelanirefaxoz.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/21315990016.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/59376407664.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614453bc36e1b---zuvuxezamisuviwolot.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/wupetax.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/23370410662.pdfIn PDF document text
    • 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_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 11096 bytes
SHA-256: db7fb14faa9368b55aea801924fe6c4d0e812ab65581c9bf7e6323920fd9d0f7
font_01_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 18596 bytes
SHA-256: fc5c57047c9d652fd7c75c1b28be542ddbfcd2b2c01bd3173b525543923d4e7a

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