Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73566764df0ea45…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 01:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc22fde0e04be16fa711188e9e771196 SHA-1: b77723e3e6c25b8169e555dae38f21324d4bcc69 SHA-256: a73566764df0ea4509303295431ea4ee89daad6693d040c8ffc2878740fe2f87
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm pointing to other PDF files, likely for phishing or malware distribution. The presence of a security bypass instruction further supports a malicious intent, aiming to disable user protections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/sunuriwodefedesibosidava.pdf In PDF document text
    • https://farsiherbal.com/cache/fck_files/file/86560755196.pdfIn PDF document text
    • http://kyea.org/imageuploads/zuwuz.pdfIn PDF document text
    • http://silver1979.com/upload/file/22084886368.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/zogolatufami.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/19470041970.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f032166c1b---goxunetudevep.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ebb0baac13508f43ebe075569beb30dd/64666504769.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/89889317063.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161364a8959d43---1023262786.pdfIn PDF document text
    • http://machulski.com/public/file/89979234879.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/bafip.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/xukapefu.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/wusiwidarepinevubo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/dcbbd065ca09217da5a9fa47d73637a7/95797879957.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/filuguroxijax.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/nolakumirojexajemiwilopup.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/juxejuvuwarex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404eeead2a2---56009107254.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302c9606694---58126714503.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/89305048123.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/24823626869.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/77387255584.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/20262451931.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/14335101828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+unblock+blocked+websites+on+chromePDF 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_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 17464 bytes
SHA-256: ba6fb65520bd61e978ad2aa98cd8d29887441e18258c9025240c36d1bebda597
font_01_sfnt_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 10880 bytes
SHA-256: 1507e8350609062eddb18de80a53c8d982c08209ce3efb9c99fdf67ef6094fc5

Open this report in the interactive analyzer, or submit your own file for analysis.