Malicious PDF — malware analysis report

Static analysis result for SHA-256 a834da12faf50a3a…

MALICIOUS

PDF

160.7 KB Created: 2021-05-12 06:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b1f0dc19cd3c3349b8fbd9b431a3bce4 SHA-1: 7abe103eeb54c71a484257dd4c9ea821b2a0ed09 SHA-256: a834da12faf50a3a02b32183fbc8281850340eab08e0d6a6d1fc6a1e3ccd146a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c803998ea12e4de4b72ad8a686cc6ce/fifudamexefud.pdf In PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/tm2077rs2p8t23sqh8p5jmviu2/3841681696.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mrsjnhsu9hb4k6bljlp7ogq3pi/27123943170.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb0ba0ec9---88251578170.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c7f698c6467f74750e4335fcf92c891b/6912617392.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e7a2d245ba8c35ecc740735892088214/tejaputanezagebowasaz.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/6f1e90e72879e09984c0886a4a07ad26/82625988789.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fbc602437eb87f684a282dff02a94b6c/modifatejitomelaloruk.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac3891b54---40735957772.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ikj2kpte0h08654ff0cq15t7lv/felokazakoga.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073e6af85d61---gipowave.pdfIn PDF document text
    • https://vestol.bg/files/file/rujuripaxutawikevow.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160985a29b61af---19162875900.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/848a4f5b7352b767b1ed866e44a8524f/50448005307.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d790bdf7a---53543765306.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/56176802665.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dell+precision+7920+workstation+datasheetPDF 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001f290.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F290 12044 bytes
SHA-256: ff15379203070c6707a746a2d149eb043e1fbce205794bed285ba07b8b379fe6
stream_006_off00024f71.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x24F71 21828 bytes
SHA-256: 8317773100a3e2b79a63d7d0d13f295f89c2ac414dafd98e862ec07f72d1f7c6
font_00_sfnt_off000173dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173DD 34036 bytes
SHA-256: 5198b9c534b8ab9e46aa88ea48a7590de5762ecedaf59e4165842d5088f5f647
font_01_sfnt_off0001deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEAB 5828 bytes
SHA-256: e0f83fb00ebc350623d377214585d0c31f5f5d011d21b8ac8101fb9e3f5b57e7
font_03_sfnt_off000214be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214BE 22500 bytes
SHA-256: 99f9c1933c561794de0140f53eccb5928707667cdce944dc6c510c286efcea5b

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