Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a899977266e2936…

MALICIOUS

PDF

88.6 KB Created: 2021-08-10 01:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fa580126d44054e73059bee28963e81f SHA-1: abb11e2aacfa437eb436a9280284f68ea9237240 SHA-256: 2a899977266e293603ca1b36d3caa19b343cd5030033ec817267caeef008258a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to manipulate search engine results or redirect users to phishing pages. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=tabla+de+medidas+de+brocas+para+machuelos+estandar PDF link annotation
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c114782d8dd---72669053355.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/90d381269435c1c6460314dca6447b7a/zugoperigedejefuxibuf.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2483632716---tizebiwoboxepugo.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/pizuzunilolebo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ed22e4b621565b6f70fa1303a989975b/92967144078.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/46390643001.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a0bd0df6d1cb630b298e52d623b8ad8/zadukujugagukaneve.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/66199103472.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/27286492216.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/witogupemagux.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/mipuvepiwowupiturerexewa.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wozejekefipuxotonokival.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/guwewatokubiwi.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/26fd9fd100cf34ce88754c2d16c3d85f/kaneladujuve.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a1d0385833fc623959549911fd27ad91/83912324227.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f09aea42199050f13f4f85dbacd8deab/nakugunosolovutakafo.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ce310c8b0b11e0cb6581bfd0efb4e624/kudalazoginaxazekipit.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/78577939062.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/6820331065.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/72327884633.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a227335d074---muvisoju.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff49b5254d6---rotugazop.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a45cf9d52a23b921260f87b389a2d522/jepizodalosowuliwulovo.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_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 17988 bytes
SHA-256: 63b9f80d5a0cd5bbe862aa5d9a3910a6afeb66e5b6d70861727b0bb75748c4e1
font_01_sfnt_off000122f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 10980 bytes
SHA-256: 36c3017bb688e98a077604c581ec3a76e4e90323ebd97223c68a7e06871f9a85
font_02_sfnt_off00013c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.