Malicious PDF — malware analysis report

Static analysis result for SHA-256 da34605090ec3807…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 01:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 20345764c7881655282ad497364f5ac8 SHA-1: 0ad0cebd22409dfa96eef2549d5fb868d7efc79b SHA-256: da34605090ec38077dbb23dcfbc1be24ae005a4f90e001d85a3d7d96963b36e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://crysiq.ru/uplcv?utm_term=vmos+lite+apk PDF link annotation
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140f54d5f182---bageviwisunotunokizekor.pdfIn PDF document text
    • http://capital96.com/userfiles/file/62787360931.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/85175998191.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f13c1f14cb---tutukuzoxegopatugoxisusas.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/tumegupawupuxawusiloxer.pdfIn PDF document text
    • http://arsvet.ru/img/upload/369399189.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/5698627954.pdfIn PDF document text
    • https://novitas.ro/files/zaduno.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/s85h791om5uvkun7j3k1a8u757/jenivusemenuvuwubivuvoda.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3d6f76d9456a91f5ce94f8c707d0a3ce/19371821155.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/beromepakoratudajuja.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/takujakudi.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/3220167806.pdfIn PDF document text
    • http://sbkf.org/files/files/musaletavirugubimis.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16143b80f0bd4d---zoxomut.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/9991504435.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/madimuwusijakoforakapo.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/28168201980.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc46da7e7---18104459717.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d2f531b2---pujaki.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/44748461429.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/44084443115.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/27122234979.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/tugub.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_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 10268 bytes
SHA-256: beb51d8024f0bacc69723efb885bfc4ae3372a1b73ebc69d9936c13b5ddc6a8c
font_01_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 18796 bytes
SHA-256: ecc3911f02d519984fa8bc2808b1bb596e718a1fd8c366087c1f3e6e577da514
font_02_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1