Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a3db5d3f8ed3ca…

MALICIOUS

PDF

80.1 KB Created: 2021-06-15 13:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d36042cff7068e3941f72d889813db31 SHA-1: 1072622cae5594292ad75bf8cd0ad52c4b16ee0c SHA-256: c2a3db5d3f8ed3caa9357ec9feb4889b3d442999556530015733cc4ad68dafd8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous compromised websites, many of which host files with suspicious names. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=pokemon+monster+saga+apk+download PDF link annotation
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607951d14b174---tatuwoweverafipitevefoj.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/63dcbde363ace5c35d9765014f310918/vuxin.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd95a37cb7---lubaxejirabikure.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bbb7040f---gamelukaw.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c124497662c23486ad0b3a3500676f7b/3309818482.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b93a0a2e5---nalamasaropim.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/14878443272.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdd225099e---genoluxirarig.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b56c425915b50b8687566a223568d9df/40019959283.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0c9a6b6bf602906cc5f0ebc0c76d12d9/81355901761.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/875823f26fe307c5918b4d8de063985c/xevotupekun.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087efc1be2b3---mutel.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/40666987700.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e48184e6c4ffb57c7540c7bce3cfcd23/54974616534.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075cae066dbf---xadotaw.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/28620020047.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/jogefefikufalez.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/829t51625ob2r8nejdscembm8a/97676870272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 5436 bytes
SHA-256: f4eed7bf1c654ec5d04f385ee53c584dd13f9622bc23ee4b41723c95aadc1f27
font_01_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 11020 bytes
SHA-256: 61be0e2b5c548d0937bef554d203ea61c6541ff546bae79b3259a4f0ea4c7d50
font_02_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 16616 bytes
SHA-256: 7ab81ce3d92a9ec80982bbbf7df4378fdf9290867a146be245f32411f9d17586

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