Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a7b4ce92d2089e…

MALICIOUS

PDF

99.0 KB Created: 2021-09-15 07:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 932ac22a67a104094506fc31f2e4cc33 SHA-1: 5f2646e7b33828881615a9d136cb0d9fbe9a4924 SHA-256: 98a7b4ce92d2089e3aa1b43cdbc33c82fd54784cb59c19eee2da7d63983cd66f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=how+to+edit+read+only+file+in+android PDF link annotation
    • http://roland-toys.eu/userfiles/file/29249789660.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/52ba0cefc3b798cab86208428b339ecc/lanomef.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/26869357848.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4741fe9ac40ac9574fda410ea45c4cd7/63998641936.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/3010801771.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/77317897225.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/48550899109.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356fd21b29b---48694552137.pdfIn PDF document text
    • http://agrion.org/upload/fichier/1952885426.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/podifano.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/38328566190.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f5979a0d---31717759317.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/75069596722.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/75050295810.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/68421713841.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/wiwagutikiwelusa.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613871b7b8512---13582383642.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/fuzoka.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/79089851950.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210903225118.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bccdf1fcb1---56527777496.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/xinesasijepo.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/23724170012.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_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 17116 bytes
SHA-256: 54bc591b212413a7a584252e3ec3ac9010138d21b5264c933162d51763f31a1d
font_02_sfnt_off00016687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16687 10368 bytes
SHA-256: e83c33fec1599946b67e3bed107676257878cc845328a952cd8126616d1526ab