Malicious PDF — malware analysis report

Static analysis result for SHA-256 283126d5d8c1cbcb…

MALICIOUS

PDF

86.9 KB Created: 2021-09-10 17:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2310380cb697c79458a4e99be73f83bd SHA-1: 0e7315bf3cac0e6db0164752b381453625ca9a80 SHA-256: 283126d5d8c1cbcbe4036b44939c2f78ba4a62231ec5dad1c188ece79f317d46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document is part of a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection further confirm its malicious nature.

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://laborke.ru/uplcv?utm_term=xbox+gift+card+codes+generator PDF link annotation
    • http://s8radziejowice-paszkow.pl/userfiles/file/bipixosameretezed.pdfIn PDF document text
    • http://htwy.com/upload/file/25167566058.pdfIn PDF document text
    • https://cowik.pl/upload/48686233359.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/xozodifineselexolef.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb42d532b---18185938203.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/54937327217.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/paxageseletilolixavarewik.pdfIn PDF document text
    • http://hanauhrova.cz/files/mitewowovakedigivafux.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/34015668473.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/22988593345.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/9717044748.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c47b25061---kavovifilunuralaxoga.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/67496958530.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3d8trcsrbjn425onsiiu8gj65/42754655956.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210907095729_1983782584.pdfIn PDF document text
    • https://triosms.com/userfiles/file/zikiz.pdfIn PDF document text
    • http://horvathortho.hu/tmp/nazoxafobewezalap.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mi2dj05nh71edoo05mdvg15248/gojijujavuboteruwalar.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/xedujulutubudiruwa.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/suwigabobed.pdfIn PDF document text
    • https://elemonbg.com/Files/File/joreguwedobugorimupa.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/tozipotalusasod.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ba14e871d5bdcf9d88e3d35c529d5cb6/86933957231.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/deforinetido.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_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 10852 bytes
SHA-256: cff2e46ba134d0cdf9d5f008c28acb63804e1c1dedda47844831f29dc3f35974
font_01_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 18536 bytes
SHA-256: 9d95708f2475e493a53d58eab886c303ce4b6a76d42f2ed4ec47ae80b4eb33bd

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