Malicious PDF — malware analysis report

Static analysis result for SHA-256 626081d3adaa89fc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 01:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8aebebeba5c8ec3be2dfa4b0cc0b0eea SHA-1: a8e50ffb283b21323dcd88822dba6db414560e27 SHA-256: 626081d3adaa89fc4dffe8f5a7b09fd1784f559962e7256d3d6bca88f6dcf049
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The document body is unreadable, but the heuristics strongly indicate a malicious intent related to URL redirection and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://aimara-bg.com/userfiles/file/fisetavakixolasaso.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161000573cbc4b---jofaku.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/futisupiro.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/65886391369.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///7606108092.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/22982511054.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c923e286c2e---xezitalivotagev.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16108d73a85918---vubelo.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tokatokifokiral.pdfIn PDF document text
    • http://land89.com/ckupload/files/77151474143.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/24662195825.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/14662311155.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/lojurijemipupuwekeso.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/mizalup.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/jadobiremukufipesoguzosi.pdfIn PDF document text
    • https://yuss.it/file/58175188313.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c3d9e52b---lunipinesujakizotegepoxo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/97c67745eddd5bc10a88417522d63071/xovigex.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/lewelebumatosige.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/770ij4mk99slqreuqf71bnegvq/vekutikid.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8af2d1c0621af517cd5e13c59945d71f/nemanewaruvudami.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/44427525522.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a091f2f40d9---rukixavodila.pdfIn PDF document text
    • http://bmhs1964.com/clients/a/ae/ae3b7fe25fc1fd458a9bccd7578bee9c/File/nokeriwobelurujugagabi.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/lugawegutar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=running+on+empty+jonice+webb+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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 16068 bytes
SHA-256: efa83daefac5eaafb71f39d9f9a22aa22788127341a6999701d513322516ce69
font_01_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 11100 bytes
SHA-256: 446439e87ffc385eac022e9fcd87bf40ea186af28b344463d1a14bb781347e94

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