Malicious PDF — malware analysis report

Static analysis result for SHA-256 62126b6471ba9a24…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 15:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28970f508f34afe905a4c8384a7cac16 SHA-1: e30ebf3cf8ad54fdc546757786cb2cce4f8b1ceb SHA-256: 62126b6471ba9a246508bd3f43c9e26a040224729e16736a289487e6930c4a35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to various domains, many of which are associated with compromised CMS uploads or are part of a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to further malicious content or download additional payloads. The numerous external links indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=download+apk+pubg+mobile+versi+terbaru PDF link annotation
    • http://portalpr-b2b.es/img/user//file/_0201141001630502167.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/fejapominubajodedupuge.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/77954685909.pdfIn PDF document text
    • http://1careglobal.com/upload/files/42619883914.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/widiritumelimetaluraten.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/zaxufamufofujavevof.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/werifevowex.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xoxokipiwowimax.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/64633529395.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614976e6ca92c---sezugodopuleforixebex.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/98286162327.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/tilutub.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf0e332cb---xuzagefuzinapuli.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210926104627.pdfIn PDF document text
    • https://areicon.com/images/file/nibafupawozunawor.pdfIn PDF document text
    • https://5uempat.com/contents/files/semusegeweposekogupig.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147613193b16---52228768462.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/levigunanojo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b82c5c5e13be417e4582fd45822afe55/31145633910.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/41629286242.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/7872408249.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/japux.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/66740964328.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_off0000b1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 15796 bytes
SHA-256: 6c913d85889955f5af657cdb1bcda915f772ff26992b1419d20233f4e1998eca
font_02_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 11220 bytes
SHA-256: ab9b6d321588724ebaabd6cf56f305b5ced59399a015bb1c2e0d7150b4773e85

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