Malicious PDF — malware analysis report

Static analysis result for SHA-256 68821c869f643a96…

MALICIOUS

PDF

86.1 KB Created: 2021-08-12 01:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f304b2f86f9d02a081ab902c7f39869e SHA-1: f5a383d6d6659def1681c98750007f2aada174ea SHA-256: 68821c869f643a96a251d088e833af3afd714dd43d7642a17f24cc193618fd7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links aligns with tactics used in phishing or SEO manipulation campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe477bb28c---mibin.pdf In PDF document text
    • https://weeb.nu/userfiles/file/72948348645.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1v3g0st7aejfrqp4k6agv5fa52/jawiroz.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/10e6n00ogquv828osi769m7p87/29695300405.pdfIn PDF document text
    • http://anupbolivia.com/images/files/bigar.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/26820992134.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/350451af4131761c70e990eb5ba60c26/62704900334.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/54751601394.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/0g8maecpii8lvrl8ph2jcl26m2/99084473571.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ce7078b8c1abc2bbdd81aa3aaebc1363/21768894535.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/raguzumifojewivawegi.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/60677278734.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/noxikekovafepidofemirajuv.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160867d7f72b44---67335046239.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/muvisol.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/bugojepanejosuraremudata.pdfIn PDF document text
    • http://gr-chem.com/upload/files/zapuvukodamavajujanagasi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/afbeff2094b013992d1ac86a331dbe77/74913016312.pdfIn PDF document text
    • https://crpm.ch/ck/ckfinder/userfiles/files/muvisoxexixinawewa.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/9303026542.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/48644362969.pdfIn PDF document text
    • https://led7.ru/file/79929493000.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/53664596760ff4d53dadca.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ebab3b7a---34497480543.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/bozenusosenu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/lu8i4k81rij1obsb21s3d9sg5n/wutilukemuvugoxuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+ssc+duplicate+marks+memoPDF 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_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 17156 bytes
SHA-256: 8f08f4802240e318a6057ba8275ce98fc4a1b027c8478cd0f01a47bac0ad0e82
font_01_sfnt_off00011831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 11020 bytes
SHA-256: 1baaa0a203760c6fe340200b200bb3ad9a902527f906ff9c4d7e2faf7f1bccad
font_02_sfnt_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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