Malicious PDF — malware analysis report

Static analysis result for SHA-256 d737a70f7bb77dae…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 23:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 948a3c411de5e74988f2ee9a5e39e064 SHA-1: 549a4c5dd4ae484faf677d749d33fc603cf1a102 SHA-256: d737a70f7bb77daeff1ee0bb8123e8e9e83457c169f4cac76f14d075aeb61090
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates a potential for executing malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://phucatgarment.com.vn/ckfinder/userfiles/files/jogaxenogemun.pdf In PDF document text
    • https://4wheelchile.cl/admin/uploads/file/vatenelemizuz.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/68087884320.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109021204226529.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/mebifobetenat.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/61784021625.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614910bb95e72---nosulamozexik.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/7251758646.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/boxewarikigezibitowifepew.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/95711698635.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/19839911658.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/99791744315.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/mekide.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0e1a0f1690583bdcdcb0a4c8b9192a33/gonelamipepopimumawemul.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/In PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0152a3914---lozumukajumibinejajax.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/vuxejafinomijuru.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021921114301942.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210923185053.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/bidixilipitiv.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/kirokezebusagilixebopax.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/42385620537.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/25385718a1591ecffa9a83405804ac25/8753447308.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/99987433930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+11+redmi+note+9+sPDF 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_off0000afb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CB 10404 bytes
SHA-256: c931db41083ef19bc4d390d130fb45b6e451f22a58da01bc66bfbf54034db3d0
font_02_sfnt_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 14836 bytes
SHA-256: 9880bd605a4ac437c8dfbfe73aaa45e4c148eb36072ced9d8699fae8f9533eaa

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