Malicious PDF — malware analysis report

Static analysis result for SHA-256 1245bd508d483f1b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 11:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cf30c174648f458fc9468f03eba85e0b SHA-1: bb6f816d26e49a27480b5366e9b46053dd0c89d3 SHA-256: 1245bd508d483f1bd9f1ba64bec8ddf891edbf72e13986107078e0e4feb176f9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. ClamAV and ML classifiers identify this PDF as malicious, likely a phishing or malware distribution lure. The presence of external URIs and link farm heuristics strongly suggests an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=where+can+i+watch+the+goldfinch PDF link annotation
    • http://lawyergz.net/uploadfile/files/9859578698.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/78596495194.pdfIn PDF document text
    • http://dfanchem.com/upload/files/nemuretobuvofubadogiwerex.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/guwevine.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630808184.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/5880581604.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/85446870937.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/64219549986.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/tezewegegopobuwibo.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/jazupakakudavapisuged.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/nimawamijinevogofanar.pdfIn PDF document text
    • https://banghenails.com/upload/file/dapumur.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/wuzomewebudadelegapi.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/dexagagamuwu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134534e439b1---rivufej.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/xalomoro.pdfIn PDF document text
    • http://datcat.vn/2018/file/winixukudozanuwutilalaku.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/wetaxemagaxapesadule.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/woledid.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/wisijunixesenade.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142d232bff46---zovep.pdfIn PDF document text
    • http://gibisch.biz/files/files/tiwabulebuvibenabilu.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/joxepubabigo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/74189731f5f8235cc89644e677f28fd3/vuwelovenuvazakaso.pdfIn PDF document text
    • https://accessnepal.org/userfiles/file/98632610443.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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 18024 bytes
SHA-256: c3113113b9b1060e275ed59c74c45e96d03046b514f949b45b1548191481d321
font_01_sfnt_off0001109d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109D 10664 bytes
SHA-256: 429f7ba800fef549a96a08a12c828f79cb16d279a210d02fb99087e75e46df53
font_02_sfnt_off000128d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1