Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b16174c058c4dc…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 06:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf8d30b644ef51899849039405027f7c SHA-1: 096d3c56359bb99d8fecb0a56a00410faf866a49 SHA-256: d2b16174c058c4dcb1bc6320d81c7e4b00516cd80c3b6799ed35b1deecd93289
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of multiple external links and the detection of a trojan suggest the document is intended to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://arqing.es/ckfinder/userfiles/files/jevem.pdf In PDF document text
    • https://dm288.com/slicice/file/diluxilawugebexadudoni.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45a878188952ed9a14ea0ca48c17be25/jofukijidalujokax.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/51683529384.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4f9231a14871792f3ab7846875ce3145/47085261922.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5d3cdc6ffa86ded47acc02a760315193/4647776280.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/85602951794.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021060900564625.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/senokorejuxo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tlqfmqfmn6j0dk5jd10g146ta0/rusigufikesu.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/seweluwajokonegu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a85be67443d---ranurumapatapekiz.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/79869362935.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802f9d40f4---gibapimifituf.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d52ef8d2688---vojizuwobovokizunez.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/dumosuvupeturagixuva.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4d1db0edebe4f20d387ff717ec14b3e3/77784623371.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093a86106823---lapelepomiriferuj.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/80110227574.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3a01cb6373fb6ec641d089d4f4d706cb/2101311753.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1f54f26f4---57944733364.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/26392887860.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/zirodavaxewomi.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/6d3ca8aa3676e8f5a9130a9cc263f05e/bejuzifud.pdfIn PDF document text
    • http://naucseto.cz/storage/laresaneranig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=it+hurts+so+good+can+you+say+itPDF 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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 10636 bytes
SHA-256: a82c85b9cf4465176edcadd5462300e287b479aa7e44d0009ac319027c20baa8
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 18408 bytes
SHA-256: 0017e5187c08b244e5eb9b9ee40df7c861aae3fe1be3cd33dc9ffe504e0b8cc1

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