Malicious PDF — malware analysis report

Static analysis result for SHA-256 46439a233cac146c…

MALICIOUS

PDF

86.9 KB Created: 2021-07-14 04:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29cec7fb1da80e2c1e81eb0f56ffbc25 SHA-1: ab1aad070dc35d7d62985990af75b1875f56af14 SHA-256: 46439a233cac146c16528c8279b1b554f8ee0ea0062e6656bd75f07950ebcab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various domains, many of which are hosted on compromised CMS uploads or disposable infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/570d272e49ec9c8ee7e36d82320fb058/64688356588.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/8d51elgeiko72ul1fbuj903r5e/wobepejemif.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab23dae949b---poxukos.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/68804753048.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/32938970016.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084375f665fe---2079608755.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/14/file/20210614_160204_159.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/kb9aivra3qihnqgacivokc06v0/migewakagakozo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160815accedcbb---xivoniroza.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210604020129.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726404b6dca---96668712396.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/58680043626.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/nl4bb7c3qoksdb3li7g9ddde57/49805025885.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160da7b53bd57e---82446838737.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a374500cea8---43902879976.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/35036311846.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/27849900953.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/meron.pdfIn PDF document text
    • http://sns.hu/_user/file/38701528239.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/74020979435.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e618ec5663c415761903332be6d7e075/zimowitotijuxor.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095edf8cffd3---78600949957.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/73790f006b93b50f6448a7e9388c59d2/75248428609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=stage+right+meaningPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/35219fee0c8566b71591f3b659dbb21d/zixuxumiwonodul.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_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 16832 bytes
SHA-256: 55d6694de28ee28aad98ae5c3c90f58d802249e262ef893f46138898f6fc822e
font_01_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001376e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376E 10296 bytes
SHA-256: d46b6232d22abdfd1bad4345783ca24657f68c16dbef27c2127044468adeb0f7

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