Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc14a9f5910cdbd…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 12:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dac10d6ea5adcc92e63ad26c7c5a5c78 SHA-1: 92406b8c962857eb829b87facd826aa3833e9d29 SHA-256: 3bc14a9f5910cdbda442bf99ae74641570dc6f48f2ed3a32ebb7f1beb5978b74
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=hello+app+mod+apk PDF link annotation
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ublbg2pitp2obseqd5a66uuelc/kaloromawagemirekaba.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/vatumolirebamax.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416619273d1---9363382490.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/kedawo.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/jiferajenepoxilusez.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/18644415640.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/39133375254.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091603523497.pdfIn PDF document text
    • http://93564497.com/userfiles/94170897571.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/derikewazibo.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/sivegobuxulobirafi.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66312169977.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/52909614677.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/pesivudinuda.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/11669958730.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076df9f035---80599953097.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c5ec0dc90b818264282e7e81caa470b3/barovurivejatabulubiweme.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613891de12ca8---98258168277.pdfIn PDF document text
    • http://kco.su/userfiles/file/60325197887.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/5621800242.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/tajebexekaxakogufatudux.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/11900220859.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_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 18544 bytes
SHA-256: fa395e32bd02a556d593125c899e49170976436bb9e30fc75a004819cf39af96
font_02_sfnt_off000129f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 10072 bytes
SHA-256: 56766937dfa1b9ae6cfa99c0d027630ccdae0d17655a9b27cc58170e9ea56aa7

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