Malicious PDF — malware analysis report

Static analysis result for SHA-256 e439796643bb867c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 00:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d82b68f0499cb26dc95b71efb2b2239 SHA-1: b67dd9cecccd80f4097aa656de7f09d189ef99a4 SHA-256: e439796643bb867caf8c1d59f4049118104c7993c90c96e34a86cf9800ba6e5e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5305

Heuristics 6

  • 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.
  • 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
  • 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://medvor.ru/uplcv?utm_term=methods+of+tunneling+in+hard+rock+pdf PDF link annotation
    • https://idealist.ro/userfiles/file/58093263847.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a35deb08d---69784238597.pdfIn PDF document text
    • http://lucann.com/Upload/file/90708612914.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/26150654440.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/futumadi.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/gorunopotoxi.pdfIn PDF document text
    • http://svx.su/ffile/file/jediwenuguxefilokukotad.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/kulub.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///34377105502.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/sakakukidujepuseraxutotom.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3affc7ae4---45474621212.pdfIn PDF document text
    • https://digireg.cn/upload/logipufulibipona.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/voganod.pdfIn PDF document text
    • http://emachn.com//data/attachment/file/60238756404.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/9233881250.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89893db3e---99464903223.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/didite.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/baxadepijisotekuwegen.pdfIn PDF document text
    • http://simonide.org/userfiles/file/29601616008.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/28847451093.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106e46e6a016---vadesovulidovosaw.pdfIn 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_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 17064 bytes
SHA-256: 3573b3accca75c9607945a7fa23dd01012def42bc15076ac1a0bc7c00a136da8
font_01_sfnt_off00010fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 11084 bytes
SHA-256: 2fd739fe3d05eb8dfb35bf373bae9b4126e0f49734445634d28dad33d46256a0

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