Malicious PDF — malware analysis report

Static analysis result for SHA-256 99984b878af0dacb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 16:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbdfd62d5b4554a37cf7d4e041996471 SHA-1: 201e5a55d345e10d5e3c4fc3ca44f1549a1fc6a4 SHA-256: 99984b878af0dacb6c4ba27b16839933999c5aa34ab10949a19859c42cc5d700
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites, likely to facilitate further infection or phishing. The presence of a visual download button lure further supports a deceptive workflow aimed at tricking the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 https://huntic.ru/uplcv?utm_term=kalia+yojana+odisha+name+list+2018+pdf PDF link annotation
    • https://stephankeppel.com/userfiles/file/8303640292.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/77be3cdb62a3e2851936763841d10d47/serub.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/94675395706.pdfIn PDF document text
    • https://ijpdua.com/contents/files/ziwujimorekepirutodaromu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e637a0b0560---nubupexubanotuza.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/81120774317.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/33941991710.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/baditasa.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/fuwutuzotavov.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/degusotiwave.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/vuvelikopekamajaju.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/96896e039c0886baae140c18eb85e8a3/34860635008.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/2krv9be5mcu5s0n5bpckvfells/nigefosufusomedavej.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/61635684021.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/dipugawasedinago.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210625_172715.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/15470650753.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/85711901989.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/2038978127.pdfIn PDF document text
    • http://12shio5.com/contents//files/norupofanisutovawib.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/98497536800.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_off0000d1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 17972 bytes
SHA-256: 3c630aae2be7b73384bd08b6f9380f31d281c4291aab68e130ca1856b2ff052a
font_01_sfnt_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D2 11400 bytes
SHA-256: 4faa5f8923a5c814a719b62fb245d38a4b51e0a0928eb33bb2a8366c2645c747

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