Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da55a4c547b897c…

MALICIOUS

PDF

106.5 KB Created: 2021-07-05 09:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5fb6a7b6a783c8ba163da827f8954879 SHA-1: a0ff2e603e4d678fe86dd1370231b022b13bd297 SHA-256: 5da55a4c547b897c365cce5a0f291cc2e7af0807d319e462cfff7c7ecc68370d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://vtvxm.vn/userfiles/file/rerigefewexakepiweru.pdf In PDF document text
    • https://associazionedynamica.it/uploads/file/voxazo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099ff7b55753---76486920687.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d5ff4e5c2---nurezezugo.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/52723325949.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/dtt9o0flr3vi5lfcd86nl6dov0/46653667694.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-12/20210612151427108197.pdfIn PDF document text
    • http://blueyee.com/upload/file/200345007306.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160791fd3209ff---53892668379.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/wisux.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36447457fb---95815655766.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a3851cd87---60084120031.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6be97b050---25154716520.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/wufavopipenafujarov.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/pozajakaxitojevaduli.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/sfn3df3neeqe5nknd6dom99m7p/rugadaruraja.pdfIn PDF document text
    • http://aweibel.com/Photo/file/81797244287.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/jipifijijuboma.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec7931333e---49108107206.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/8376289858.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3072063f4d61621cba18bca26b666747/18168639894.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/simodalesewuribupov.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/madejapabekojejeg.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501115320173697.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/64aga5rqg8pk69etbuekkrmkn1/favajimur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=allergex+for+bee+stingPDF 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_off00013f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F95 17328 bytes
SHA-256: 77dabdbcb4fd9ee7b78134fe23b1ee63415ec253c5b2a50f333a300ffac83bae
font_01_sfnt_off00016c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C9D 10448 bytes
SHA-256: c11cf724b80d9e0e1fed9ed7943b608266a93c59aacbdae3045a44b8fad02275
font_02_sfnt_off00018472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1