Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d74cfbd9fc96e9…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 20:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c030a8eefefce12ba84024aba9061e23 SHA-1: d26b2f1d76bb3921d648da45909dadae55275c7b SHA-256: a7d74cfbd9fc96e9287f19b47e479f74b3b1683c4cef2879cac9caa29b19053d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=power+clean+apk+2020 PDF link annotation
    • http://guojingmall.com/userfiles/file///79947183845.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/78034922881.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426498ccfeb---dinorugiwuvapibidesipej.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/sitaxa.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/xomigawoxekegiwod.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109240258486978.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/63524017923.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/xebidatonasofadivusofoger.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472dcc5618b---93049989785.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/60567747617.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/kirovalo.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/54003105179.pdfIn PDF document text
    • http://cke.hk/userfiles/5000117573.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/vazugigetisa.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/55134857110.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/miretifitegesoveb.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/jetife.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/13033491662.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9129dee4834e2709bd269aad980427e1/darelamadurepedemekigavu.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/podegilomu.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/remegora.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/vebivolozawudalomezulak.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/gamogo.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/36882169535.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 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 10428 bytes
SHA-256: 35384c7c65874572d7080bf295a16962f1f1fac6a1cf2d53c5868214d7706a4a
font_02_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 18792 bytes
SHA-256: 2e96dc96840ba2efa8c7cec9cd401981c1c0a232ddca5ec49950bfaba7adce7d