Malicious PDF — malware analysis report

Static analysis result for SHA-256 1906bb18328f1772…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 05:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66890f59e3b306fdd05202559a54cfd4 SHA-1: 0a15b702e34e060f29cb5f3088030b1d8e946ec0 SHA-256: 1906bb18328f1772b3e493b6aa32f072535a0c5660312c400184596cdcc5e6de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous external links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The primary purpose appears to be redirecting users to external URLs, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=pdf+example+statistics PDF link annotation
    • https://groupunsur2.com/contents//files/zisimamalumi.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/gizasefujefavewok.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/lonev.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba85fad9133---45123892200.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/siwogifagixumodivikerarul.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/38ccs14m5ptteakjfuj7q7njm3/38587396455.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/5267545052.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606de7bbc6d71---25324660073.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/73677928060.pdfIn PDF document text
    • http://orenprom.com/img/account/file/17089861608.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/86612179992.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/nudiwi.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/fivumogebusanemarenewap.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/zegomegenugufu.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/30912776843.pdfIn PDF document text
    • http://coumert.com/images/file/42469984467.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafb79e8f03---62384948916.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/4e3htdarpu5avd3irsg3v486tp/pitoxelorexemij.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f06f128dcb0---33609112117.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/toxinusezufepat.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3dbb5a5c4---kovog.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7553f87b2b376e9ff9e05e942d8c9e66/97175343425.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_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 17344 bytes
SHA-256: f4ccb56a714a12a6213a7d453570dc8ab307acf5ffecec3823853e3796181d5b
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 10560 bytes
SHA-256: 7266c9c302af962f1ea0bb52046f1bad55657369a3c646bb011b2ea337dfb309
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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