Malicious PDF — malware analysis report

Static analysis result for SHA-256 983431773078599c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-03 11:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1922100c9b8140c38e6f3d170137609 SHA-1: e29d23a8d03f051b661f30b2799e3d93654a7ab1 SHA-256: 983431773078599c7294956bf2070da4057021b184a7868a1fc36a47d9f7a157
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to external URLs. The PDF structure suggests it's designed to lure users to these external sites, which are hosted on compromised CMS uploads or disposable hosting, likely for phishing or to download further malicious content. The embedded JavaScript is a common technique for executing malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • 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://wastran.ru/uplcv?utm_term=ayyappa+swamy+mantra+pushpam+in+telugu+pdf PDF link annotation
    • https://foodphotoshop.com/userfiles/files/28250236857.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/29659663352.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/23645508528.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/62244444493.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c808d8ae06---vopigi.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/kobujedinavodim.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f7b1e6a27---7743579364.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/nedofudogiwiv.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/19551928410.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/83478873692.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d868b00a92---lodimenele.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/lopafatazixekobotoselib.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/zirapotibusosexefowutil.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/zuxalojudutuxigexes.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af5e2d0dfd---97548916908.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ema94hvajbaljju7c0b6pulnm0/33712955218.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/mokorusadi.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/23297361311.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9c60e1319---zonipababanojowulekib.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c22d595ad2d18dceb8d7d99062ec3ab9/gepixuvitogupin.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fe9f0507d1b8c92d5f101ae99b2a53af/74236351781.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/zupiri.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/79366be39f9caee710212010b030f3af/sidaleles.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/95ac775f7a5b396698400dfecb8e3285/vikusonoxor.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_off0000b2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 15564 bytes
SHA-256: 75b86f6d41d4c05af18b92283c43cba9815473103cbc486d45eba8aa846280a3
font_02_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 11108 bytes
SHA-256: b121f0bd556d9e1571523eb7f16b38919a387c994c14c51fe73fd2befbecfe8f