Malicious PDF — malware analysis report

Static analysis result for SHA-256 56efcf337c412476…

MALICIOUS

PDF

89.4 KB Created: 2021-06-26 02:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c78863022c8bd85f9c63b6dc85e7a00 SHA-1: 4a0210d3a0039a5d2af3c3a0c315541a570e3a29 SHA-256: 56efcf337c41247643d582a8c20b12c39ecfee1d7db5efc2d05082950e1d9b81
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of link farms on disposable hosting further indicates a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/u4ls1ok4fh1kgfimue1l5jqjfo/gotosukajofinokopuze.pdf
    • https://palcev.ru/userfiles/file/pujewukidububa.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/31be5a50e52aed7dd1fc820986f1ea75/2647265504.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/cc7f1851773716fe3b67b016d5d7b86d/28880102075.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/25d21b2e3a25ebf31e75c8b7c81c8ec7/pewuxikinagos.pdf
    • http://arcenevents.nl/site/upload/files/99849786575.pdf
    • https://infiniteprospects.com/FCKeditor/file/gurufusujezinijet.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/12c1d4d904cefc5b5897b31e408a63d2/24236246992.pdf
    • http://www.sport-konyv.hu/userfiles/file/33619348163.pdf
    • http://musorcentrum.hu/files/article/file/bazofuliranosefepifapu.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607811e3bffe6---feradisub.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7696300632db810577a4f7fe801daba7/talomedonidu.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/15ba3f994b1a70281bd3e7c12d1ddf20/mijigekoror.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/l78v3865gf1qm86daojbta1gf8/38664951248.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f76662364---6291535771.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff7b3d4808---59506959495.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077566452eba---44059118789.pdf
    • http://aimic.com/userfiles/file/98806335049.pdf
    • http://almar-bus.pl/userfiles/file/54305397988.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e607ba63---92242624673.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d893c6a2c09538f19b6c9a6b80f317ea/rijivolitenux.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b551bd043a9---57890759424.pdf
    • http://learnazia.com/fck/imagesfile/70914680065.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/54e1bcf23b691c065c2740e7b6354683/tejuvatipusenuzob.pdf
    • http://atthaya.com/file_media/file_image/file/wabezisopunofix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=good+morning+quotes+for+wife
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd69.bin
b3205dcc45d88c0ca8e92369058401117b5627d9eee895fbb26c023ba96c4992		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 10860 bytes
font_01_sfnt_off00011609.bin
746e1c9881b3f2b62ccfb8d436e0a17b5f2a97ef44a3a5e5f5fd32688bd8f179		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11609 16448 bytes
font_02_sfnt_off0001400a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 16792 bytes

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