Malicious PDF — malware analysis report

Static analysis result for SHA-256 40594d67da454c22…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 05:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1a6c638ee1295d792088fcd83b04fa53 SHA-1: 944317d4bf5222dbdfc5a16d087f70919bf4e5f6 SHA-256: 40594d67da454c225be30ebdf3ba02cddda834787c1aaf880a8da8934beb1809
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 external links, many hosted on disposable domains or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://cructi.ru/uplcv?utm_term=construction+sim+mod+apk PDF link annotation
    • http://wo-kop.pl/userfiles/file/59560424990.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/butekimidipaxu.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/34899879154.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/97886134587.pdfIn PDF document text
    • https://moolans.com/uploads/files/47950967423.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/72562002993.pdfIn PDF document text
    • http://exim5.hu/_user/file/38085666646.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca6c499c4---pugaxesisa.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad865e4d4---70493337054.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/dedixugonerewaturoda.pdfIn PDF document text
    • http://pedraferro.com/files/files/runulagodawapevudurofana.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/gupebamalun.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/84963207973.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/niwazowoporomibub.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161514614cd857---riwalokamivifipijepufu.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/xelobavibufosigalu.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/23158579086.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/98019345663.pdfIn PDF document text
    • http://195exim.com/datas/files/kumunefuwobekedivuv.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910121915.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/90454236599.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/71400603247.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/202114133328.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/59660647882.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/lebebadipevipojudebijewa.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/60762958735.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_off0000b4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FB 16128 bytes
SHA-256: c951806c3ff14f7a6ec027aad3830be44a3823794b1632850bf5700397c2c4d4
font_01_sfnt_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 10720 bytes
SHA-256: aeb802b11ece83d725f18d3b5ab83da3291864034946dbec6ad47d404b9df5f8
font_02_sfnt_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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