Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb20a59d8df3da7…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 07:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1f85123c245578af08a35d26bb441c2 SHA-1: bf054c6b03daf627ea232b916daf45e4702425b6 SHA-256: afb20a59d8df3da7308be5b4f3daf9b0e84a6a05a467a11644f40c78f9d0dd10
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. The 'ClickFix' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command into a terminal, likely to download and execute a secondary payload. The document also contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139717483d5e---61609699551.pdf
    • http://edituj.cz/res/file/88519267823.pdf
    • http://vstarmp.cn/upload/files/20210901_065823.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/g362pr9fqd8cjiktpj8ocasd0k/dapelaleneduboxidawirun.pdf
    • http://zlhk.ru/upload_picture/file/77498189618.pdf
    • https://e-fasteners.eu/media/file/65545019479.pdf
    • http://onishi-kyosendo.jp/archive/xumaxujoludejudutasunuxak.pdf
    • https://orcasproje.com/userfiles/file/88213149047.pdf
    • http://happyhanool.com/ckupload/files/xawozapezimovebamumali.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/66570080319.pdf
    • https://mobilpetrol.olajpark.hu/files/files/manuvitufod.pdf
    • http://klimagra.pl/images/wysiwyg_img/file/41498866067.pdf
    • https://nocenzura.space/web/img/podborky/files/pimulaju.pdf
    • https://sanruouvang.net/images/uploaded/file/80820423940.pdf
    • https://fontan-montag.ru/img/upload/zazaboxokixizog.pdf
    • https://durgabas.coop.np/ckfinder/userfiles/files/luwika.pdf
    • http://gorod-r.com/userfiles/file/kaxumom.pdf
    • http://recko.ru/ckfinder/userfiles/files/6159380612.pdf
    • http://soleilboo.com/images/uploads/files/wurusebonetuk.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/fewudusitoga.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/9o8f3jaouhpho9vf0t8hths7ip/6957763080.pdf
    • http://baovekhucongnghiep.com/upload/files/worosivifiniguvobo.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eeca4eadf---31278964852.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+cancel+safe+mode+on+android
    • 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_off0000d2ae.bin
ea0c238f882a6c6bebed96dead42772083f77c386d7cf5fa7c595e10f1e65250
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 17512 bytes
font_01_sfnt_off0000ffe1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 16792 bytes
font_02_sfnt_off000117f8.bin
5376d70542f635ea02f9f07cb64f518d35a5770e0efa6d75b5ccf88150f1332c
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 10712 bytes