Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a26bbb1c3ccc3ee…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 03:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 840a1a21b35c7449d2b5f73351becf9b SHA-1: f1fdb2c9da1631bc217eff07203187d338e0c221 SHA-256: 7a26bbb1c3ccc3eeb3afe8144316f2e2f6530d90eac2b9c6b305de6b0e63ad69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and link farms strongly suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tvkinter.com/file_media/file_image/file/24936918816.pdf In PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/11218146107.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/71010567963.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/lofotezuzepozowazutanakuj.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/70752894797.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/74656922342.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/wufojewugowuredus.pdfIn PDF document text
    • http://newo.ru/files/files/kigovotovutiluferesuj.pdfIn PDF document text
    • http://timocomputer.cz/files/file/dajajekepofitu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399c2fe7c0e---2377169408.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/nadedadat.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/sekifuxuzokalurupazosepib.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161323237ae3d6---sakosiberogazaxesejefoke.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/pefatuji.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/35336138845.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/12873298670.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210902_012452.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/jewitosizox.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/pevubejid.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/kasovepotivevixafabaled.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/99070866269.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ruflvpebpvub2t4cp04jmahlo6/rusipunezojepakekowarugig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+app+maker+software+offline+for+pc+downloadPDF 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_off0000b929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 10940 bytes
SHA-256: d3a1c1ab73ae45ac50379ed6339b77d746d6280f99e8c8b69fec022d3e6ea518
font_02_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 16616 bytes
SHA-256: 884bf824691f0c91c223ef551744a9faa3b65a5d75c99996e61ffd547f7901cd