Malicious PDF — malware analysis report

Static analysis result for SHA-256 b880b1592ba3b5d8…

MALICIOUS

PDF

73.4 KB Created: 2021-09-29 06:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c4ff7ef986d3f29a65953fdf8cfe3a50 SHA-1: 4d5b58f8899aef8d8f07764922bfd9787eca8a22 SHA-256: b880b1592ba3b5d847261ebbe2825a4fe3732c28beee3684a2ac0eef290d2d57
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://infrive.ru/uplcv?utm_term=the+best+loadout+in+modern+warfare PDF link annotation
    • https://restavracia02.com/userfiles/file/44620968949.pdfIn PDF document text
    • https://n-tlg.com/files/file/nojamazegamefisopigel.pdfIn PDF document text
    • https://clove7.com/userfiles/file/tarojo.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/53700982555.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/woxozewuvudu.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/punupabagaledoxedoweduped.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1d3f30ac---naxumetusijazu.pdfIn PDF document text
    • https://windscrm.net/files/file/70469702387.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/21191660720.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/bedesuvabunibopaxiwuduta.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/33699394306.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/fabadolimususumeninupe.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d52643f3---82670314936.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/10023731919.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/xafudemijazefavun.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/40023360471.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/kufujibigavolezizago.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/26743024167.pdfIn PDF document text
    • http://taxfreepoint.com/file/rapodixevu.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210904203256.pdfIn PDF document text
    • http://afro-safari.com/upload/files/pijesigidid.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351dc43b2c4---roguridez.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_off0000b2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F6 20252 bytes
SHA-256: 15521ffa2f71bf8019099f3e2354dd51b730cd56bbfc93917a527f0e1baef0e0
font_01_sfnt_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 10908 bytes
SHA-256: 727d0cfdd83bb0d751e360eb1a4b1803a929c84e45d9e18b7843de8cd3c8b207