Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf58e3be33a0a80…

MALICIOUS

PDF

67.2 KB Created: 2021-09-29 03:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e61757315c837e6fbd8dadff86494d54 SHA-1: c7b02f0c4c2e5987d4d58e1979f332ddf4646a3e SHA-256: bdf58e3be33a0a80da2f014c759fad40ea02bdf6a8fc8ec859e231a71400f9bd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common screenshot lure, indicated by its small size and image-heavy nature, to trick users into clicking embedded links. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing or malware distribution campaign. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing the phishing and trojan threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e8b2f9852b6b50c53d8437c530a1084c/wumub.pdf In PDF document text
    • http://tai-group.com/upload/files/78380240650.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/49240893971.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/funefale.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202191615248.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/zurikexobexulonewerika.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210929063525.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/jefopujomegonezozibisira.pdfIn PDF document text
    • http://3q1p.com/upload/file/210925044528981251o18zpgt4znmk.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/gebuwafoki.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/72128561134.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/zovifelobutaxotudanifazok.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906035506.pdfIn PDF document text
    • https://htchninc.com/d/files/vakusujajodipadi.pdfIn PDF document text
    • http://infosierra.es/images/editor/88033140436.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/48885722588.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485a28249b1---22345627292.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147ef2869007---koredasinidulavefekupela.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142e46c434b1---19015213347.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b25d72e086---44511864227.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210928052336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=12+rules+for+life+read+onlinePDF 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_off0000ac4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4C 14276 bytes
SHA-256: e70d5e789dd0003d3302baf7a011d4770de6a4914873d7ebe1f1095b572b3dbd
font_01_sfnt_off0000cfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 10424 bytes
SHA-256: e94d6119bdd197a5045ae012a83c343780a59ca4ca887b2fa87b619ade2f0b35
font_02_sfnt_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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