Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0671ae6b43c34b2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 02:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de2965007284712be11dccf9a60d7fce SHA-1: fd789ac0c73bf829ece96bb7005a3bdd66d8e0a8 SHA-256: f0671ae6b43c34b2f86d66a683a128aed0b99aa771084bcbd162c466bb8b1bad
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://coretry.ru/uplcv?utm_term=how+to+tilt+pdf+pages PDF link annotation
    • http://xmzs.org/userfiles/file/vowisisapofezet.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/nopidun.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/laliviwesejelulupo.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/morom.pdfIn PDF document text
    • http://apicn.net/upload/files/lijolade.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/10349026386.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/kinejivo.pdfIn PDF document text
    • https://hssanesteban.cl/files/9827904739.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bfc279f68---95057359900.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/51256524355.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/kimeg.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/wunudisifub.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/12433044762.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/63587678883.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/pafodilifelagigolulajus.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/dezowekutagijuj.pdfIn PDF document text
    • https://csn-alliance.com/data/files/laxilekakix.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/71264163424.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/lajimifodavi.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/kupokux.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc101d1d16---87558122522.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lrac0mmt067c1l911suj9mn7tj/48357767538.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/gaxuboxu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2f1095db6---52455238322.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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 10544 bytes
SHA-256: 1d79eca355a1bd52668064ef91aadd46fe9fcc7e8b5d6496c4a77dd0ab179e4a
font_02_sfnt_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 18128 bytes
SHA-256: 1fb8920f76d25eab2e4c6f1f3a6057e571299e79b61f84356a59d291fc063167

Open this report in the interactive analyzer, or submit your own file for analysis.