Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab40595557aa9e48…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 01:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6055a7915f8bdae324b288ec82e6f0f SHA-1: 62c8a2facc21149a951a17dd1e410f0cfd613b82 SHA-256: ab40595557aa9e48b5dab499052adaf98d1ea9249464e834abae218a1173d35c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised websites and disposable hosting, likely to distribute malware. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d5cc6d99246bba52821a1e17da345486/34652764919.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/008f236652aa3c53f1e5d5d3db912c10/delepukitanonesano.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/10638822126.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/it71ftuec9ptpg1fcc9kbkgamv/xazomevato.pdfIn PDF document text
    • https://wagaskar.com/media/19866548168.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/luzavekodejonuti.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/46365070092.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/fln90b5m5et4st6p11huoec9r0/vavunixekuxumosuvomediva.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/sijofe.pdfIn PDF document text
    • http://machin.kr/userData/board/file/zosemal.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613387ca0b698---99314785190.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/38078779609.pdfIn PDF document text
    • http://status.cz/UserFiles/File/bibijujogutid.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/63bj0lj55ujb5e9tkg5vg2a7su/64004687865.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/64287388080.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/kukivofofizebiwonilapaneg.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54534384d6---muvemelitakudirowokamot.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f42dfd00---91276046793.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8402eba1b05ec967b682e83ba4ccb101/tefuzo.pdfIn PDF document text
    • https://eniedu.com/data/file/20210807153547.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/felepe.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/kudogobapukiradivovezevo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/82497785710.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3f96d442058bfdac472637bd2db2f5f9/zasimomubobisep.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/pafavovomilerawilefososo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=defy+me+tahereh+mafi+pdf+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_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 10796 bytes
SHA-256: ea19bc064f3253927005f2e6ac98d896657dcb2660c2e7cbf038fee18115fc5b
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 18464 bytes
SHA-256: 9870c1c34d366a62a6517d33ed79753cf327a95626af2d1ba95e8fc21c9b8d1a