Malicious PDF — malware analysis report

Static analysis result for SHA-256 0321284da87d73b5…

MALICIOUS

PDF

83.8 KB Created: 2021-06-30 12:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 135266c4a681a0dca1a85404e936b172 SHA-1: b66e535627113ef0aeb15b03df28368f22c36775 SHA-256: 0321284da87d73b5083672ff8d43cc31317d984dff289b407efa7723be245d5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading to phishing or malware download sites, and contains language indicative of an invoice or payment lure. Although no scripts were extracted, the presence of numerous external URLs and the 'SE_INVOICE_LURE' heuristic strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=how+to+create+sales+order+in+sap+pdf PDF link annotation
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074707a4c1c9---28889093683.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/xonexedanebonigagis.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a40964130a---20158089740.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/54541603471.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/mevidu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/jorob.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/5150893848.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/024f51fdbc307811d7daeafd353631ae/laxibegolijitiniboga.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///18560895139.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/renuguxadubatozolozipibu.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/6710177c44377a123a7010b78a0449e0/82159719278.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/vupawiserawixekodapi.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/zamilifuvelopubusaworagis.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b73e78dcf---najigavapibiragenifupa.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/zasowadadarimobigejiv.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/bugebudesot.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d566ff8574300bcc007e0af77fb522c9/3682202086.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210514083411.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac216045894---82720669633.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adf5beaa066---34131792819.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6cb577d26---sanex.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/zuxeponomixuvekozewiro.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/14905458888.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_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 10688 bytes
SHA-256: 10495b38de75f800f1d8f322310f81511ae5dab4e3ab47d3c0102fbe14552f9c
font_01_sfnt_off0000fdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 16944 bytes
SHA-256: 53e86a41664c396f08d0f07c9b71c98dd35f9658ae55431e5b2a07feec1777be
font_02_sfnt_off000129e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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