Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5ae155f25cef7c…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 01:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8179738d6e9cb6cc507ba93bd23ba78d SHA-1: 3a655c6003b14df6817de079cb13daff5b3a67de SHA-256: 5c5ae155f25cef7c5aab34d58f7cdfab0d0edfd184c2430e3e699a21c264c8d8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b08a43a7a6b9037fc3b4413bd8e273c7/70581840516.pdf In PDF document text
    • http://mrpokedb.com/uploads/files/84016933446.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2ba6443b6a3d4f143b0b97421be4ce81/29537295556.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/19955694529.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fcdb8fe9b---getezebib.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/lelubujowipiramarivud.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/69518327094.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/62499354869.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/19839911658.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/kepibozopevaw.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/61008593840.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161399c896f764---39575132789.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/vipijik.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/7941106925.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/xagavuvurajewavag.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/159547144.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/85521764051.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/wafew.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/65280081374.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/58499471839.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/13991739234.pdfIn PDF document text
    • http://iviltra.lt/images/files/90588773589.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/wavikufokure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stalk+someone+private+instagramPDF 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://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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 17960 bytes
SHA-256: ca6ca39c9ad41a8cd43d2b58dd238611b3cb4d75fe5826e2063a44e0d66cadd5
font_01_sfnt_off00011be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 10828 bytes
SHA-256: 4cd45a511359af58d575686eae4487a741020bbd3059fac19f2058c339e7be3d