Malicious PDF — malware analysis report

Static analysis result for SHA-256 9530eef67ca058ff…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 10:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 730334c380c03ee9f8ad9cf98f4033cd SHA-1: 69af97a8e8bf77d076f6f217aa2c0551a9780ded SHA-256: 9530eef67ca058ff5c43fc3c5a20622ea72fde641499a1691a2a22e3e3611ca6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=the+hustle+torrent+magnet PDF link annotation
    • http://friend5190.xyz/js/ckfinder/userfiles/files/30758888380.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xezovunusetolidemog.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b47ba87746---2555178376.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16144315e5f953---64059232640.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/repup.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/54051268224.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/kekatipo.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/75729014676.pdfIn PDF document text
    • http://iccarrentals.com/files/file/dukibarusukolekezaweja.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/44683354404.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/wabuxobut.pdfIn PDF document text
    • http://synergyproperty.com/images/files/37847263438.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/74085508290.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/zomibuwujidemajubaz.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/dusilufesuwedinulofiwusoj.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/77695360288.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/42627606515.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/rhn977kqe6h9t359rm516vdj9h/fogomaku.pdfIn PDF document text
    • http://mobitransjogja.com/files/zujugukijaxogonulat.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/wamamiji.pdfIn PDF document text
    • http://afro-safari.com/upload/files/32631774052.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/91161874957.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/gasupumoborofa.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/84118165445.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_off0000ba27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA27 16600 bytes
SHA-256: a4563bae131421e50b774d609cf8260e72a9e39aa8f297f6d2033104271f146d
font_01_sfnt_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 10524 bytes
SHA-256: 6a3d4d38e6b3b5aa08b5ee84ddb60b78e416344ca0e0b4c0cd6c55af790808ca
font_02_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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