Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cca5e375c44150…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 02:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 17fd5bffd4dbc959818a77dd451a44b6 SHA-1: d31002fb8d2477d636f300d57ce82fb327a75c9c SHA-256: 77cca5e375c44150d609ce4db7043f6d21d547e4bc8a3d9169b7352e2521a92d
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download' button lure further supports a deceptive workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bookatowncar.com/userfiles/file/rudalamagogavipafude.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d2fba3e7---94040154056.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/wukoxosifobilopagus.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/14rv03mk2egeosb83fs5jo7ir5/70402448140.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/58017258312.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d56c1a393f---lilinozam.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/balesavogijotamolitu.pdfIn PDF document text
    • http://nova-auto.com/upload/19176843935.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/datesatox.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/pajaren.pdfIn PDF document text
    • http://aven.su/userfiles/file/86950568953.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/53216979852.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79d413130e---guxizozadopow.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4fff0ae92868ecafc8baa30b04e1e785/81363741442.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/visumurolutona.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/fivagadi.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/ribawutikedoribo.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/82053529420.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2de135f8f2909d3100ee990a267731d7/susibekow.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa9062ada---sobusajilo.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/16276600710.pdfIn PDF document text
    • http://mqskin.com/luutru/files/fawedekiru.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f921581c27---disolutigegugogas.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/13736833850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=manual+caldera+baxi+fourtech+24PDF 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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 10940 bytes
SHA-256: 520675417a26280e72d096db9aa54722ca90a0802f665ce65f744f9048cb2dd9
font_02_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 18528 bytes
SHA-256: 2e62e845a20a1a46afd4dddf6fffe4667fc9c2900c104229c968bfe09da7c996