Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d38f83402cb6d7…

MALICIOUS

PDF

85.1 KB Created: 2021-07-02 09:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45d7713257ec9f7e6fd166b1b66b346a SHA-1: 811dd88c590eea7a25dd03864e3141250f82dc47 SHA-256: 71d38f83402cb6d7f4b530895b39d0251a4e0079d3b07991629571606a2130d7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites utilizing vulnerable upload plugins. These links are designed to lure users to external resources, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/38ba62f4c7bb8a9fa90a8526edcc4893/betufidedebix.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccaad190ba---dekovag.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079109ab945e---73797086739.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/19997765164.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801094635b8---vuwinukosefojudum.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/43145013682.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d9202be083367e55d12af43cb8c9f9df/sebenuronilokigazujodu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eb81eb9b---temowewigadufurejux.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/fedenig.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/77082898204.pdfIn PDF document text
    • https://ka-base.no/images_content/file/nizerised.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d3f76afc822aaaec1652333fe046c522/31308944496.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/c853ff040369d8f2d7346f6cb1cb0c92/52819062499.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/17364769226095302015eac.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/364be8cb9bf966c3d181fcd29965ff27/tupigesasipizadozarazad.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/86700877d76060212c5851ea8e36da5c/melukawanulexa.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/95819469958.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c889976fa99---lujutemofanuvufogutako.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/mojofukarafan.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/474gjh9a3dd7t2o3ocm9utr4ja/zubilixupiliwajadolawiso.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/72543886880.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9ikr3odf8pu28j8qqu0tnv2ob0/fatarabarobi.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/zopizesizixa.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b8e6b12cedddda6dc23d67ff25556cdb/49905803438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pain+on+the+back+when+breathingPDF 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_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 16464 bytes
SHA-256: bb96fd69e34fe973322fba66ad5e3b701f8444a9a200ae2c179ee5ea4aa696c8
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 10616 bytes
SHA-256: cde75209e6828e736c72675ea3a03b3f169613bd71e1dddb4c2c6365001f0891
font_02_sfnt_off00012f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1