Malicious PDF — malware analysis report

Static analysis result for SHA-256 2018c2546039884d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-13 05:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3bd60c0a49ca4ab0a439332a0efe81d SHA-1: 94fcd4a0abc2daf3fbefb8c625be776e62e0b198 SHA-256: 2018c2546039884d6872a0324b771c46310c07061790c51aae0515bb0542e3f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via embedded links.

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://4els.ru/uploads/images/files/jajusukivulofopeguxibef.pdf In PDF document text
    • http://2m-m.eu/userfiles/files/zogepudanewofujalomeve.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/12096111814.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133722f38650---44441034433.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/gibokavukoj.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/xarur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc874ee9de---72239216840.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb01c86862---85825007815.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/79640554292.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/luzuzogo.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/42595894848.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/13331267185.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/megewexixorekiwegati.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/24259582202.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/babogidezonajerodajojumew.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/foromu.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/gorizaxiburomu.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/wotedixig.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/31379144472.pdfIn PDF document text
    • http://holzweiss.at/lozixomawopimexiwulamoda.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e811b3ce2a---zajaganejogebixigujit.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613638550b737---pawuxomamulivawajuxan.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/tezopanupusotokuvu.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/vitunekofiretujegizezib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=slots+empire+no+deposit+bonusPDF 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_off0000b89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89C 17272 bytes
SHA-256: 0bd8b40bc400b5f11fb1f37e4b556a10c134a4268f9d7fdc620e4ad4bcb55cab
font_01_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 10708 bytes
SHA-256: 3249f68bb41c55e8c6ce65af3dc588581e17ff3def7f46aa66c8f661f6218d4a
font_02_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1