Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4800a70867923e6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 01:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dc060183fe7bd4fb0d5bc3596e59960 SHA-1: 3350feccfb2fce52a2808a5cf1fbeb432a63d0f7 SHA-256: d4800a70867923e64970a3b44742703eb0374117620f2eda9b51d1ef58156e01
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to various domains, including compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security filters by instructing the user to open a password-protected archive, likely containing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=safe+combos+dishonored+2
    • http://auto-spec.ca/fck/file/98694101393.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55611da9a---42208245721.pdf
    • http://rayocazar.com/images/elfinder-1.1/files/file/rekoximi.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c41d6c49a---sekubofugeberejebanewudal.pdf
    • https://kingcarmotorista.net/uploads/files/52746307582.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80b0319df---tisixukasosalog.pdf
    • https://rhodium.vn/uploads/news_file/63768096117.pdf
    • http://halongbaycruises.org/upload/files/litinikiwo.pdf
    • http://saxonrt.hu/img/userfiles/files/vewigedazabinuvugukepuxam.pdf
    • https://abzesolar.com/uploads/files/limuxogu.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/a6428798dd34aa85f60a1cd5cb651025/99146645132.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/vutumexitubuzuju.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/6062732679.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17680719e2---26311457096.pdf
    • https://jxlmedu.com/file/files/20210629_100129.pdf
    • http://geo-equipe.it/userfiles/files/77328385678.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/03hvniv2tnnib1kda6hmg4nueb/47788381168.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8c2ff1f87445057a05dc34ba5c796646/nebiwu.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fj12h6vsvbevm6mk0074f63n9/92049307349.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/nozuvafepowaxos.pdf
    • https://alarouba.com/ckfinder/userfiles/files/84585488224.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a4b0ced1593921e916c3ec10c15934ca/gesepafalezekilijewu.pdf
    • http://beiwendq.com/userfiles/file/rujulewumo.pdf
    • http://china-spec.ru/userfiles/file/zosebodivafafego.pdf
    • https://sunarchegypt.com/userfiles/file/jerodasu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 16792 bytes
font_01_sfnt_off0000f301.bin
665b8bc07d79a15b57e730ce4030d058fdbad59b7452553fc70b916799303279
pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 16240 bytes
font_02_sfnt_off00011cfa.bin
a9bc97c15a6c1b89ff903274d47b8aac50159ad03d57db3910c53345c25fa310
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 10932 bytes