Malicious PDF — malware analysis report

Static analysis result for SHA-256 e860ad554868727e…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 14:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33cbeff8dd36d0f35ee10d09cbda406c SHA-1: 922bc98a4626557ce9b869262d9a8c00295aa0e3 SHA-256: e860ad554868727e5b7949739fc4c0f337c85a6a77cb1688b77341ed9b81994e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://laborke.ru/uplcv?utm_term=best+ebook+reader+android+2021 PDF link annotation
    • https://yuanfuconstruction.com/ckfinder/upload/files/nimudibezilaze.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/gezunogokajajugonebutaz.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/12258838750.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/17156134583.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/97603119177.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8a38a4fee3e4459cd1db454cd3602b07/64328528158.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/40291848701.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/55633618279.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/50632564037.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/kavegimixerediwetewobawor.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/39996134903.pdfIn PDF document text
    • http://lscapital.it/images/file/68829914391.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/kubefojevur.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/pomipaxenojixitogedozotuj.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/43840020550.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/wolajotikokofa.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/44892452259.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/diwotepugumimobet.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/mowix.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/3d16fc9e901f12ace0f5d1c8e9ee5009/54501260284.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd413307f---xubim.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/polisotadodirujubujus.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_off0000cead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAD 16940 bytes
SHA-256: ef8a4cd707d3b81c06411d2d20397e13b114d40d6031f30c963317e88188c5f7
font_01_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 10772 bytes
SHA-256: 72238f463a9e0925115ca35b7417a96d14d7b2719fb89822546bfa6a5f58e136
font_02_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1