Malicious PDF — malware analysis report

Static analysis result for SHA-256 b063efbf49113af9…

MALICIOUS

PDF

88.8 KB Created: 2021-06-27 04:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 413abe1ba8788346a9fb8b589f3c8bb7 SHA-1: c2d50651819185ced3690ca954627ce446b68bcd SHA-256: b063efbf49113af9a0356e9de3f70225d50d73df190a76c28c4634fdf502a94f
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, including ClamAV and an ML classifier, indicating malicious content. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. The presence of external links and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=the+father+and+i+are+one+verse PDF link annotation
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b7d8cc69e---35251495232.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/5ievtiu0en56ee7fbsbkhhru2t/fokupidan.pdfIn PDF document text
    • http://raczcsalad.hu/files/53739997991.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b5ea6f4fd0fd23ccde3be5d6069b7c69/33012014946.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084f1e8ef0fa---32189145815.pdfIn PDF document text
    • https://2acontractor.it/images/file/61893713614.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/zibukobufomegipuvova.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a36e33a0e01---tumorulegobadanas.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/38792142156.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57404ef67---28658391112.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a73d1c04e---desosodanuluxudij.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/85095a39b3703c9c93b2826fe8aa0a17/33808760038.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c14a2299f---dikurapetibunugunalona.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1815267a71---gelezifunozowuwozif.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/kvf8u1o29fdl3lvh14a18c0gf5/gonurowopafopuboluwokosug.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/tiruzemomekixozakalux.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8fc06e5ff---pebapabapuzevefifokalir.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608714fc65506---35755077772.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/7591007074.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d4a24fcee---sekusisoxinu.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/lakulivumudonenevo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bacb0e7f971---zalipinimexelik.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210627083646786.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/11138913931.pdfIn 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://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_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 10432 bytes
SHA-256: 63e36e536d41451b71a11b02b0c9fd27ff5e53baeecebefe6179d28ba1356f9f
font_01_sfnt_off0001119a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 17088 bytes
SHA-256: e13413d26f878e7298be497b84c76201e862f7201c8faf7df750f6e98abeeea1

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