Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb1869277b6954b…

MALICIOUS

PDF

77.5 KB Created: 2021-07-07 14:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 33b94d5bad3ba4500fbefa6dc016019a SHA-1: 1da56af65b0fe052379d8cdf6db6740b20d3a98c SHA-256: 1bb1869277b6954b7559e54782033cefd17a080f6073a7b2e42facaa88e5f8d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The presence of a 'download button' lure further supports a phishing or malware distribution intent. No scripts were extracted, but the overall structure and URL patterns suggest a phishing campaign aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://crysiq.ru/uplcv?utm_term=degree+3rd+sem+english+question+and+answers PDF link annotation
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/udo5tfuq469qjff6tdi0pl0bk8/rapuselezonedurixilid.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/27835302332.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/a62bm1l1r5h7m6forossgcauge/18021077059.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/56980593953.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f1634dfef---92264503947.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf044f07378---23046618119.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/misiwurezu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a5f3df2f---zores.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/bc3cb3d17e2bd868a7614f03e3d6c186/92898421359.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/wujedilixomoderakuwadawis.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/repufujudofafatiw.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9df726d10---28345607072.pdfIn PDF document text
    • https://smartdeal.pl/files/upload/files/47870399688.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/bkjg3c1khnmic3k837uf0itq4i/mubosixogagukutos.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/55260670702.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/luwezexazovo.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f353f0c631ccdf972b051de131bdae86/zukimidobovodopase.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/53285757193.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/91974539412.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/32911f0b83c172c4f539bce5771a8e2d/1365523192.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073937ac1c98---48944269610.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f07f554---34064011143.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/13310564897.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_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 11200 bytes
SHA-256: 5b5b567a3ba0c43bca3b4d01ab808d3dd9346ba28e34dad7f7ddc51b90d624d0
font_02_sfnt_off0000fdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 16508 bytes
SHA-256: 36bdbd99e1780edeee675eb9f312562fd755f27005973c5b288c755c8cdf91be

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