Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab74a0089efb844d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 07:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a523f4543a6edaabe1183de609930aa4 SHA-1: e8e8e5bc572ff34e8ffe2ae7f1d4ef44bab6ae15 SHA-256: ab74a0089efb844d8cdf0b9f34ae739b46bca3c6b89b1db4feed8eec6d73c585
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is a phishing lure, specifically instructing users to scan a QR code. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and link farms point to various domains, many of which appear to be compromised or disposable hosting, likely used for distributing further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=smartphone+scan+qr+code PDF link annotation
    • https://solelane.com/ckfinder/userfiles/files/71799078411.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/64117407868.pdfIn PDF document text
    • http://anpo.vn/upload/files/fugotifonamajorejubikuxe.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/43906607555.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/nugomekogibojokivetivisun.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/gedaxagubutukaxokopegi.pdfIn PDF document text
    • http://rotang.net/userfiles/file/33823266840.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/tuxenisabosezupifa.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/16466961428.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/61354286918.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/e0355447ce772db0a766ece18ad7d640/95177931383.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/33959125118.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/25449324686.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/zobogonorijozofir.pdfIn PDF document text
    • http://amdind.com/userfiles/file/pukusogidajufazi.pdfIn PDF document text
    • http://princeverma.in/uploads/files/gibapanum.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/72332500630.pdfIn PDF document text
    • http://htygroup.com/upload/files/lavifunasowevele.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0bbe52394---jodufojomanutojibos.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145c2e18d872---feposesikatavazeboriferur.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/52920049781.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/4906485309.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/47452609125.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_off0000b26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 17068 bytes
SHA-256: 258a91bb2222d829d0f93568fb2a31d0c58cb225a89b3716eccba670326aa01e
font_02_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 10864 bytes
SHA-256: 2038215a1e9b7fd0240d2acde4521e33930ae7e763bd3eab67562269e70ec38f

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