Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62dc26c5b1a2d62…

MALICIOUS

PDF

101.1 KB Created: 2021-06-28 09:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80d565b856443b6b40b664dd669a77ce SHA-1: c66b7c7a21678caa250cfe66a97f0ebf63636c6a SHA-256: c62dc26c5b1a2d62d676792c6c07a15286bedd90a30b5b23fed9be4b44c2413c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The embedded JavaScript and link farm likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=ocean+eyes+piano+notes+letters
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ocfk8qdtr38do7qtqfacvenfmr/86771367858.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/n5bn0akpkphp9gjp2ad8j8ppm3/33968858328.pdf
    • http://cardealer-space.com/js/upload/files/ladijevumukur.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af9aeb4b5---vuporurumedeluxa.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/467652958ab5d05d10555aa318348c71/tikumuvanenegagipifalofes.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160749700735cc---jaxudabikaxuwamun.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce05f918205---sibalobaxitajijawuvozaru.pdf
    • http://busanpc1.com/upload/fckeditor/file/lomonovidenedekaramojewaw.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb36457ea9---rorebumakarabug.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6640182fbd---46258358074.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1617e994---55360802721.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/37961011181.pdf
    • https://newtech-utm.pl/userfiles/file/kolog.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c46324141db102fbc21c0eb31871abb0/zugodilav.pdf
    • http://constantemails.com/userfiles/file/162286359329676434033.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1c8e69f8---24038375138.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b45d3bd46ddae2edc2b3c8142cdaeea3/46896674891.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5a2d93db7---9764084363.pdf
    • http://recviem.ru/img/upload/16050276457.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10660a6261---viresos.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/fd93269c1fbe2898e3ead159591a1bb8/sokeji.pdf
    • http://grandp.ru/userfiles/file/bakafiwerixo.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a0fb900587d6fa61197707c5030cbf66/zekimedodulugukutagegux.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c94.bin
b64d6f961fc822883bcc71c65954779568f4d2ca7202da09e3741f724baf4b24
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 10504 bytes
font_01_sfnt_off000124aa.bin
06ffa8173eb588fec3a05e94d055eacf65c096f246e92b39997b834d7475e4dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 16124 bytes
font_02_sfnt_off00013a08.bin
34bc9fe9f372211ee619bbe3985ac311c1cfae4cd3f1fcd5bccfbec2e4514fb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A08 19436 bytes
font_03_sfnt_off00016ceb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16CEB 16792 bytes