Malicious PDF — malware analysis report

Static analysis result for SHA-256 858b622a52b716d8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 23:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbfabf36e681624eed09ed129d6b8c7d SHA-1: 158a27315c52e36d9838b922b583e14b9badf5e7 SHA-256: 858b622a52b716d87dfe228436998e343246a6ef78c0d9e13aeb18faa03b3193
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, pointing to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://doitoutdoorz.com/file/LWbbpwat3OlznBhA.pdf In PDF document text
    • http://vertracapital.com/uploads/files/18727937347.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebac3e5409---vopubopukolafasezuf.pdfIn PDF document text
    • https://megashina24.ru/files/files/kurikibubaz.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1g9pecdi354jit3arei95n27q4/bafomiwimebifol.pdfIn PDF document text
    • https://salonrewards.ca/images/file/boxabajufuxama.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/96646565520.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d520875f06---27692516802.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210916_56230D7F1A62441B.pdfIn PDF document text
    • https://ferropula.hr/files/58155507789.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/48780316245.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/46226237937.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0730b360e---86863446729.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/55240399901.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/47150663084.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/liliwevajusuwamili.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/tepujulobovevewapifi.pdfIn PDF document text
    • https://triosms.com/userfiles/file/41344814082.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/pevulegiripifelari.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/98040189547.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/duvavazepabijumake.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/92914050498.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/20863890635.pdfIn PDF document text
    • https://sadex.pl/fck/file/fazamijejivojadovamapiwur.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/belajovugapiwezilukarata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hanuman+chalisa+lyrics+lyricsPDF 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_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 21792 bytes
SHA-256: 628fc31bff04c88e14a393bc694dd4aceae0b783f4e77a5ba71e3b8461584be1
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 10352 bytes
SHA-256: 4e1f4c34a8a8edfe2e137fe6c22863a84d179168237ab69e88ed2d849bbd5ff5
font_02_sfnt_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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