Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4ae871d3fc0ce7…

MALICIOUS

PDF

88.6 KB Created: 2021-09-01 18:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a557ab05052752e1613394634495993e SHA-1: 543fd96358028007e1ed97b4288c7a634e6a789e SHA-256: 8a4ae871d3fc0ce7bcaa47cc11a6a7fd76db9b6b147d8f96b90b25912d6ba536
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised CMS uploads, suggesting an attempt to lure users to malicious sites. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081811eb401a---79205444568.pdf In PDF document text
    • http://dailitara.lt/bites/uploads/file/pudusikut.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/gomevigid.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607690e348bf3---kamamigerimazop.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7d2bbf81ad538196c6f891fe92209ab7/napejexafoxum.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e07d69cd06---10275429390.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607add45bcac4---janupafazunakarizofafoba.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/iiiqop3ugd2gros7v25mmj7ra2/33166370224.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858fad7b185---gasupesolarirobolop.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608713fc13cd7---33121004238.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c666b82caf0---27614598301.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b4a717a2f769d27c4a7d7ab19b215b0c/wedadogi.pdfIn PDF document text
    • https://photojet.net/userfiles/file/15533470715.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/dusogemupesibelopijute.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/nudegi.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/24612957541.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/24697312113.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/pimoduvidipuxorasezidi.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/64770478771.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c876384bff---96515532012.pdfIn PDF document text
    • https://cecprint.com/images/file/xidijupes.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/731b65be4b750c1047090ede5f648c84.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021061807463073499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cbse+sample+paper+2020+class+10+english+with+solutionsPDF 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_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 11472 bytes
SHA-256: 22acf149a52d275e744da25ac05711bf8c03008e09f8de359985ebe33c98ec4a
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 18616 bytes
SHA-256: 57649253ef9710dd045716bced508442ef754fa8d5cb94c921be6535dd295b16
font_02_sfnt_off00013b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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