Malicious PDF — malware analysis report

Static analysis result for SHA-256 769da730c234a606…

MALICIOUS

PDF

87.2 KB Created: 2021-07-13 14:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b918b37644c7b68d93cd11a562511ac3 SHA-1: a731697b7d6f4022a15249edcae49faf66ba744e SHA-256: 769da730c234a606c530ae7b702c516ede6758b660906b6cc925d4196c8d936d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://bularz-auto.pl/images/userfiles/file/81309675424.pdf In PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b4e7a3df8b3275ae688f9dc7c03e5104/xekumafowowebur.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607673cba9881---diritelebibedufewepotine.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35260dce1---zotajojifofedokim.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/069d85950f897deab6615826f86ef3a1/mufiwamixik.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/94583582233.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/52229673091.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/wikubu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pikojiz.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/12079535067.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160790a52c6a23---97056234407.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/kuxaxivodilen.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905a83117fa---nusab.pdfIn PDF document text
    • http://envigest.cz/upload/file/ferudewaniwux.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd34db4ef2---vofopubugi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffea1721e1---pejemuxanazimep.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/54573074917.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xipaxafutujeketuba.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e56c7b1c---7017937238.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53ea711d9---64949535422.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/31527408216.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921cc32df9e---38245669224.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cc89e7f3393cceceb8ce9c86d7983f41/14885733488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=eot+meaning+in+businessPDF 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_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 16636 bytes
SHA-256: 921dd3bc41dd28b9f259dd4b4b54825da8cfdf027391be678ce6617247d7b979
font_01_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13634 10528 bytes
SHA-256: 29ede30f4b0e2804a825e9b12af9f5479b3285e2cacd2b54c237fa9c770a4338

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