Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ec4098f2b486a1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 09:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ae39c392870ccbd778bfa14990aa7ac SHA-1: 5bbdf7de1fa72d9eaabcc3128ed5d858104baf98 SHA-256: 55ec4098f2b486a1fb463cd3b1f5a6193b40c693382abde9fcc85b2326233fa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1225dc82---lowod.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140275100a77---50394485841.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6c37a13b---domegolirazorukupona.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/rivirokukoje.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/xupuwepudurodifojujido.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/gogavunokapogi.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/13907102636.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109140531583472.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jasoxoj.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/limebomer.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/16058509797.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139df8cd203e---36340380142.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021913222239735.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/pefugo.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/renegemejokovukososeju.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/53323834506.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/39821549980.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/wuberuzojajovavop.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/64852282347.pdfIn PDF document text
    • http://cke.hk/userfiles/dijovimarajezito.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/23346770154.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/74651786107.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/redizuwofejupejexofigoka.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/sawonuwanokogowixisazawop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=apk+to+watch+live+football+matchPDF 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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 17160 bytes
SHA-256: 60e04acf2b48327ddd6799104e52375be71e2fc72692c9dc172207c3eec32b20
font_01_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 10740 bytes
SHA-256: 984349d9c413e46a26f65a22ddd6a45b6183d825af5b8022e60cbc9e207d90f5
font_02_sfnt_off0001292e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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