Malicious PDF — malware analysis report

Static analysis result for SHA-256 1528066893f0d912…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 13:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 061725c872a867ae87d3ab1384a321dc SHA-1: 7f4fa3f3dc3bec8d6cb5d342b898767c459d3766 SHA-256: 1528066893f0d912821afcd1792cc4eca6ee56ee5963895b95bc2dac3fba0645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://garglob.ru/uplcv?utm_term=how+to+send+a+video+from+android+to+ipad PDF link annotation
    • https://hometutorsdelhi.com/userfiles/files/niruwekemikozukagixudu.pdfIn PDF document text
    • https://trieurodata.ro/images/file/84449489954.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/delekamaza.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/51407913727.pdfIn PDF document text
    • http://lejonhund.com/upload/99595460858.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/33014100373.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/gutigukufafu.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/98178117493.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/70562022358.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/15348950674.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/pufemejobavelexano.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c073cb0326---93065919947.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090918183873499.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/34919724771858f6ce072fd54f2d68be/baferobejalawazajobek.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/megarumu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d0d0cc9c6---26482320664.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/5996273685.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/siribixobijigixuwob.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144453243641---55004267688.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/filoguwozoxana.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/pubevil.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/50201171330.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/pezekuvugaxolabuxi.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/zaludatipalozamesojiv.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/60597945199.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pvtnko4k1plo4e4kgsc7s57cvq/63061676393.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613668fa574ca---73347373419.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_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 17804 bytes
SHA-256: dfa3581aead0411f0fe4acb49acf0250f298c200a880bf49b7563e45dfa8435a
font_02_sfnt_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 10756 bytes
SHA-256: cdbd66daad29ed0bacfaaccb421e2a9ab1d1d61d42e7e793400e9cd619e6771e