Malicious PDF — malware analysis report

Static analysis result for SHA-256 f779d5bdaffc8eef…

MALICIOUS

PDF

68.7 KB Created: 2021-09-07 18:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f9ac2d34ebb84ff8e21e603cc6cd08a SHA-1: fb064b4dab4dadbb99576d5f1f9145b427bcf35b SHA-256: f779d5bdaffc8eefcc3f5cdf2906c73baf70993a644d8f5d7dbbf7b13cb48742
176 Risk Score

Malware Insights

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

The PDF employs an image-only lure, a common tactic for phishing or malware delivery. It contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect the user to a malicious resource. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/9093709760.pdf In PDF document text
    • http://xsjsbzrw.com/uploads/files/fujawunesajoferarexepi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9a3644e2---serusurirobaragulelajopi.pdfIn PDF document text
    • http://metallpress.info/files/monamor.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/15371799270.pdfIn PDF document text
    • http://alvitraders.com/files/4191007579.pdfIn PDF document text
    • http://innotack.com/userfiles/files/basifenekizufadinogetu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161097b6882063---75965166145.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/20835223603.pdfIn PDF document text
    • https://icfas.net/icfas_new/dev/ckfinder/userfiles/files/vutesaji.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/20450651173.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210829134906.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/xukakivibuxejam.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/603c9e050808367ce8db2b1be0de38c6/98115842867.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/bodewikus.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/kazadivawejelizalud.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ae23788c232d9a796d7489e2bd04cdf0/lovererapajogaxitu.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/xezudamizav.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/uv6n2242mk3m86atahth0qna74/kaxejaru.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/328059b20aeb2a5664910a5ba7af38ab/totigasuzan.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210517/file/16212016236127.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/fojazunubugopakomowun.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f8e26722---sitemukuvos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mediterranean+recipes+pdfPDF 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_off0000b2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADC 13976 bytes
SHA-256: 9fb685746e365b2d58a74b59b772ed76811e5b28560d72b26048e6d296e1bb26
font_02_sfnt_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 10440 bytes
SHA-256: 566c5ef5d6e66a525a8c9cc0aa8b835cbee4f77a254e9b720dc0954f0a9304a2

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