Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60f2f1e52bf5748…

MALICIOUS

PDF

90.5 KB Created: 2021-07-01 12:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ee6014116d65a06f9171948b9f6c6c7f SHA-1: e52207f370cae86d316aac5f8094348b018e10a2 SHA-256: a60f2f1e52bf5748163394e8a29cf52069a5c29e60da378e3ecbc11a4a82103f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The presence of numerous PDF links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://bistakalikotenetwork.com/userfiles/file/zarotozupikum.pdf In PDF document text
    • http://robertoantoniz.com/resources/original/file/zorinopakofuxur.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/juki15190ls6bpuut9cfivi231/5845010914.pdfIn PDF document text
    • http://armanetti.com/images/kotuzugixizeru.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd17151e56---lifaxiwi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/67535rrrnfbheqgr3tdt55rjb1/53662288860.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106211954271618.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0195626134cad4b8b8cd96fb3f08d8ad/19665292744.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eaf5492df---zevotegiganejekiwavoj.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/29dcfe2f764a24c4ba363ce9a540fd6e/15644831738.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16082e28e3ca2e---96477252697.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/medal.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087e4716b40a---97623746443.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ab6609ce---34724222513.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073af4de4b02---15789534914.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/fawatobakax.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/45601735529.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082484b6bac5---bamudugerewojaxuvibeliz.pdfIn PDF document text
    • http://bdn10.cz/files/file/88870810174.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/modolaxosufo.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/18952295187.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46fcfccf53---rasurekopelonumiperitoko.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/wepudatip.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/024a0bbb6f7675b3a83243760ef46771/tozotufepajej.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/genesozazovuropaluj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=can+you+eat+barracudaPDF 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_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 18048 bytes
SHA-256: a56d52da9c2c0b0c648cd9cc08ab20e979b9118e3b2dcf4f0b2a45268bce6199
font_02_sfnt_off00014508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14508 10444 bytes
SHA-256: f23ba864a153429c2671efa9e7e025df2dbda319b1b2531a5376e30e056fecad

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