Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b20e85c628195b…

MALICIOUS

PDF

95.1 KB Created: 2021-09-02 10:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a895d1781e3090f62bb1bd490f3b2b96 SHA-1: 70b8fe5d704d2ea535826716f91ed62f512bc913 SHA-256: f5b20e85c628195bb98edfb43af90df5dd5c846fe13bbe4473ce27ffd8021082
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload via the deceptive links. No specific family was identified, but the techniques used are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://chocoenglish.com/_UploadFile/Images/file/masonubipujeg.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1a817e3b77db2c4a8441af45e9d66652/vaxagabit.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/24479586482.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/j6sucnf74bqphunhaavbepu878/papibifuxafiporinomojug.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/88264226609.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b17336d4477905ec85bbda808a146c9b/nikatiwujuposiwemotipopis.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106150223379895511h8jsi.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/xuzobibutawadurasoku.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076262677e16---38391643569.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/zegopaxawaligu.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/fonixoxebirotemiduwuvi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adf5c1267d---buvokasalikojeluz.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/popugilubozinitulezonuvo.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/b6293209c7469a78c9cfdf0ff964bc0f/jazelapizi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed7v4tanqaise5fsuimum1ht6c/55035950066.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c7ea900c92495c1f34c7f08da73aef88/91107101215.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/87707840129.pdfIn PDF document text
    • http://eurekaloggers1970.com/clients/a/a4/a4917853023b9a70bc4506ca58f09c65/File/puxufoxufawarasaxugokipu.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd9c384cc---teniwexifezesebukomo.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/93080489125.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607b000030060---47597303856.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/dobowivedivawivuwukud.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/poe2e7fn9dsp4bl29j8859e2m7/widizekigaligibowajizor.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/36359467142.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad43c1dcad---37674187457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=coming+home+jeanny+part+2PDF 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_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 10880 bytes
SHA-256: 7b757e2833c3c066aadbbe43f47dc64d130595fb2d4dc96e96e7c86f1910d738
font_02_sfnt_off00013b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B47 19440 bytes
SHA-256: 4014966492e1001120da0f41ffe93f36d34cc0b075af41d06e62078858d5efa9

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