Malicious PDF — malware analysis report

Static analysis result for SHA-256 723bdb4d6ec48a78…

MALICIOUS

PDF

140.3 KB Created: 2021-06-23 13:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: dab889cdb4e5a0ce45b0584543a69ab0 SHA-1: 6c61e2b7a1708e4d3440ac888dcd30ce00bc5f4a SHA-256: 723bdb4d6ec48a78441845a073766a42412c93c58e0b8fa74acb0f729f11c604
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://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/08cad9fe5ed673b263a0e88066f7741e/13166873612.pdf In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160763301115a9---21818161519.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/359629a5f12322d601ab139b3d777da6/85698542957.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/naporagavavapafin.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee0c8183f---sobarixotiwatususedu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/733fcfa6b4e30fcaf597564f82d6462e/23202718619.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/72f0fd959f80f0a1bc669cc04fb09000/poxota.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/fa32075603357ebf840274283a6eaa98/54604340664.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe7f1cfcc---48404308438.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c39241e19---javolabebakegikutef.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c4e40013f---95494425873.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/872acf1e2a22ae39f2b0804f6ae06054/bafusi.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/9ab34004cafb8d5e2d2de99808393d65/datojofoxibatobojumisejil.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb27ae73df---37179584609.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210618_105141.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lumunizinasuwogodu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gujarat+no+itihas+gujarati+pdf+downloadPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000167ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167EA 5264 bytes
SHA-256: 37a40618e4b773624f7fbed265245ef4e2f747eb450d7a516e81994162401bd9
font_01_sfnt_off000179de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179DE 12536 bytes
SHA-256: d35bf9f84afdb13884ff48c8cdcca1768cf7ab31083231e40b6431be31967d5b
font_02_sfnt_off0001a26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A26C 19124 bytes
SHA-256: e79425ae88519f74cef26fcca85987f20058fb35aeea3f4499fa2e5c32883b98
font_03_sfnt_off0001d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D774 16244 bytes
SHA-256: d7ee14f66ae469d8303d1ef74a296899217b66f363d3cd81a177c3917d221563
font_04_sfnt_off0001ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECE2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
font_05_sfnt_off0001fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAE3 11836 bytes
SHA-256: b869f950e86d5ba5caf272466c5331579eda9fc434b90a0721e928f51cd9c14d