Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9de494ffa91d90b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 10:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0e1583a09bd1fdf4b086fc23944ff5dd SHA-1: bdd2a180cf18fd7d1519ac3e164a921d235649ca SHA-256: f9de494ffa91d90b6cdddd98b73c6dfc5413abba143e6d75d6418a0c210a78d3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=hayabusa+service+manual+pdf+download PDF link annotation
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3of1h6rmhg7d3nu1ua4jrkhash/49884481418.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/heofcbhgriosd893lp0tabhenq/41953814821.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/zutul.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8aku13lr7616pockir1l83j64o/pafufutinekakewig.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/dd7ef25a0fa3f429a4559a7889fad868/57758222191.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b010d7a709---punujejopureduduk.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/gonagebeveretazigudomuv.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16089e0d50c6e0---reludakonipometoxuw.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/16300169073.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/gopajizevarojotenunu.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/53ti9h8itpeudq2v01lv29citp/72388152781.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/galawuxabeninafagigulol.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/xowonofukudagirukolida.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/reloritirane.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-2/20210702223431363929.pdfIn PDF document text
    • https://12shio2.com/contents//files/74149724261.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/81506655514.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/51976410750.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/71290547687.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/13725431903.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/8189249612.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_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 11180 bytes
SHA-256: 5b60da241cf484a98c92ccc24e83958edada1f3b31bcfcf9bd4c7c10c0ecbc7f
font_01_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16848 bytes
SHA-256: 5cb783901fca2811d6ac37730f46ad9eda65a229f4b27c6406012e2dd6580241
font_02_sfnt_off00011add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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