Malicious PDF — malware analysis report

Static analysis result for SHA-256 920f97fe65accf27…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 09:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d0190e2f6b2776c5071548b6a1c2397 SHA-1: be871987d5c4412d34c254f22a51ea6612cb1a90 SHA-256: 920f97fe65accf27b98978535139ccb5efb18692cbc5107b75f9ee9f55ae69f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to external websites. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://tonwen.org/userfiles/file/28661183898.pdf In PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/41805896928.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2sabovi8tbqdas5v6vsrsjb0k7/wovagupilijuzedoxeso.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2f67931d---sexunopupig.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210905_114216.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd087443bb---3503307066.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/nhrc8m6kbg38ffeih8bd41t1cd/32219162822.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/43206789887.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/65277978983.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/62863608979.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/24179754211.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/296707850.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/vasonozemunikonomapus.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136778d4bb31---65870409047.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d26578e27008c2fe9cb518702f9e32dd/39339983768.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363041e5221---2610530345.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/nekiralulesagi.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210903200432.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/nigebamogijametudig.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/gokeduvokirodanamutuv.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/853e946401d7ca35d10b58d02eb71a99/wewomid.pdfIn PDF document text
    • https://edarky.net/data/file/juzikobo.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109081212332698.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/37857727767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kevin+hart+let+goPDF link annotation
    • 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_off0000cb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 18228 bytes
SHA-256: 6d639b4d4ce041162f8b559033b555dc18ab7a8bdf257f0936b102e49c61d6ec
font_01_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 10276 bytes
SHA-256: 7c062799cfb86cfea8c5ed2466016c3c971ad30a9eaac0e5873dee647f6a9413
font_02_sfnt_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1