Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0787ad0899155c2…

MALICIOUS

PDF

93.0 KB Created: 2021-08-02 02:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 737d982e08e25250458bd5b0b36beda4 SHA-1: 707629ba3aba418641d615cb0e53216811cedd27 SHA-256: d0787ad0899155c2eaf2df4b5cd6555e8fcad038ff0748496363b0b5ee55fa3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, including a specific instance hosted on 'asesorialuishervas.com' via a formcraft plugin. The PDF's structure and the presence of multiple external links suggest an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841dabd904c---popaju.pdf In PDF document text
    • http://banphimchuot.com/userfiles/file/29799580014.pdfIn PDF document text
    • http://lucann.com/Upload/file/gamuwederifaxifo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f6675bfa35a87e24a6ff37e24f89dcaa/60677863914.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/sqt49vabtkoiff3buiak1vlhmj/dogisexufevazafupifoka.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/subati.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842aa75e6c4---tiberuniposebo.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082edd2bb0ce---93683178275.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/7029743094.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/c7425d306d32d9fcf1fbcb0107d96fed/wekusevepakulidubopi.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/duvajeferujega.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/gapefulunus.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/zefanoravekiriwuxoxovija.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/83384037271.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/jh8s4gjd3aih1qt542oenjfbih/10896742767.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/869fae01cfd97a7ecaecddc106a33257/kovex.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/vafegewexovanor.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/kiwigewisokolab.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a30ff1414---87061152301.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/uk688ukuchb5iji92634rj7j1o/lujemazepib.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b998153bf3---95341935175.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/73393598640.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9db348dc84---gerejafegozekifag.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/kazamogigigu.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/vazogisodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=5+love+languages+singles+edition+pdfPDF 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_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 17452 bytes
SHA-256: e6f401f7a66bf3e4e155818b4122d3098c278c711aeba602d1fa39233f597158
font_02_sfnt_off00014c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9B 10776 bytes
SHA-256: 6df53a70b94c9f02007488918ab88afcfc5bb22e39385e9c213ea3cf2082d544

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