Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b4dd1e5fd691d0…

MALICIOUS

PDF

78.8 KB Created: 2021-09-10 09:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f855f69b921b17d81097e40e72a9d574 SHA-1: 7b655f7eed4944c57d37957379ac43c8f6b08256 SHA-256: d4b4dd1e5fd691d0ece3f09061944ba4d85286463ba230058aba49091cbf41f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, characteristic of link farms used for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure suggests a phishing or malware delivery attempt via a malicious PDF attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=french+grammar+for+beginners+frederic+bibard+pdf PDF link annotation
    • http://pinxedien.net/upload/files/bimitokulapofuzurizofatun.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/95867936473.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109031755043829.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/toxawujeliboloxe.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/gatesudura.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/45442728389.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/005f3e6adab0e4d134f32bb97428e4da/wofebisibiwisebososatexov.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/dokajozuze.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8516264c5---sifutirakap.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/kefewegiwigut.pdfIn PDF document text
    • http://kbchina.de/upload/gefabokuwagifaro.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/gaxesavulugetizoledanuf.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/lijenawaselonokujedado.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/16854476965.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/82520443766.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/10679737892.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/lakaxor.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/ganejigojuke.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/vodawa.pdfIn PDF document text
    • http://adriennemason.com/assets/files/gukokevojunomozufedek.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/juwilifebuwugetur.pdfIn PDF document text
    • http://samtekelektrik.com/files/jalimupezuvopepopada.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/aaee1cba5a65dd610886f8cd213880b9/jolalo.pdfIn PDF document text
    • https://purefeeling8.com/data/file/gidubekuki.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_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 11040 bytes
SHA-256: 738f7fa600b5d38200ebbe3a72776765650e31e13a74500fb72f2106be09154d
font_01_sfnt_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 19776 bytes
SHA-256: 7fcca0393a965558ddbce09215bf7683042069b20850532fd8c6834e3072022c

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