Malicious PDF — malware analysis report

Static analysis result for SHA-256 2adb8ebf7558e24e…

MALICIOUS

PDF

85.5 KB Created: 2021-07-16 05:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b6f25337313dc6ef21f63210e802d1f7 SHA-1: 1b82975c308f7ce6f7d93128936c88878b5067da SHA-256: 2adb8ebf7558e24ecc72d6f867bb142dfe29d114741baf581bac6b35caa12bd9
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=questions+to+ask+school+board+candidates PDF link annotation
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ec057e2e17f9647913063d639c7406d1/jimitiseti.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aee922c1c---mowuxivakako.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2dc38948---91288488088.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d761604e6706a89a7a1d9c2dcf3f786e/54781850358.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/nazug.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210616_001644.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/79114762959.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609f89c2442e6---bowefomazuvonitovelados.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609173c986032---74371180871.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ac2bfb74c946fe6b7cfe6d454656b11d/965995.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/bemepexelakofisowinin.pdfIn PDF document text
    • https://landbar.com/upload/files/57823226814.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ece5276bae6---30978360269.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/24650779924.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/27896816630.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609829ab87751---84622997552.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/fifite.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b85cad7b2b5---43247602138.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/zakamapijumavimezoseko.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab85dbc0a92---21424704927.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2n3a363374473oi2du22p02r32/97582606601.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff1e9c340e---43834845196.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_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 17584 bytes
SHA-256: eeca94b4955eb665819c8ecef08a205148a156d75ec8a9c8bfdf2af774bbd75a
font_01_sfnt_off000115c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 10860 bytes
SHA-256: 5ff1487f6934fc2c4768b0ee85ab6f3a856efe08ef700fc20cf143ef9cd99590
font_02_sfnt_off00012ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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