Malicious PDF — malware analysis report

Static analysis result for SHA-256 72acf27ad5e6d2b9…

MALICIOUS

PDF

101.8 KB Created: 2021-06-30 22:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8b06c79a2f0cf2454dae0669f3cb4c2 SHA-1: 806ed08595555969b7b813b370706a5d9100bb37 SHA-256: 72acf27ad5e6d2b99a4ee1624b37b3d67e31626decc0bc38a12c17c65ecc5570
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eb2fd6dff---42251627431.pdf In PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/96075230159.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f4f2d1f21b707221e21d242c9e07de1b/pedanilikipuvulafarerewoz.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974c5101fbc---93781641124.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7da4d2622---51755360222.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce5c4380de---dotegizagepewusamas.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/malaxobe.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/10597803289.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/togifipol.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/tebemexufosa.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/rijekubuvof.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094df34ed35f---wusekiwepilel.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf086fdac49---bokigajepexegojek.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/bekari.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/70494158919.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f1bc02fea---97893544992.pdfIn PDF document text
    • http://alltechsro.cz/files/xobaxunaginisow.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/de1580d3402ecf9a13f56a1a7ca13724/natagitaragelu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c850b4d59be864be1e7b171ac9de63cd/74919102849.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb424de43---15167206772.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/84678996938.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/7559940302.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/zodigataraworarategubif.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/78296187834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sky+fortress+bahamut+mapPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 17328 bytes
SHA-256: 10df0d770cb0c04a2f657d6739e375711b3d39c33ee8808e9a92b1138a1cdc52
font_01_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 19508 bytes
SHA-256: 0b3eb693b164420bc945b575a0d6be782d62ac067e2813fe002489241872cd13
font_02_sfnt_off0001559a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559A 10900 bytes
SHA-256: 3ce48a61e9fd52f347c3c1927e2f39a8f38b7e88105838b1dc12e7e59fd601aa
font_03_sfnt_off00016eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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