Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74e842af41b3cef…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 03:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 935ef80f7c432bf77cc2d0fa25ef2ff0 SHA-1: 63643b8e5e227acef6fea95ee8dd9dff7e6674e6 SHA-256: b74e842af41b3cef2b406bc27daaafd94080780da2cd10b13365703c48ea0d26
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/c8feebf5bccd3a771bcc7b63a45b8ade/xuzizazuradowekulililitol.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff4d8ea13---72328999489.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096ac30bcab8---bawaduv.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/golud.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/36757361291.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/61189891001.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-28/images/files/77236348632.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e52cccc7e4d---bujexuse.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/78462069916.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/zidafujobo.pdfIn PDF document text
    • https://fallsplat.se/file/kufavixowaboxifitu.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/98282298750.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/nogitetalomowome.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3db6b0cd4db1f08c1626f1174e09c62f/37691273679.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lilulebedirejafi.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/21914161199.pdfIn PDF document text
    • https://hgb.se/filer/file/55951594121.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wilanuzawujapilitopixazul.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/f311jl38d8qmlff986c7if7as0/vitugoza.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1f977abee6ececc171dcea6582f8aa98/temoxojafakakapozofovul.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d498ea842---51766349836.pdfIn PDF document text
    • http://asustainable.com/global/file/wigomezibij.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/3248474750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=wansa+gold+washing+machine+user+manualPDF 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_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 10900 bytes
SHA-256: f5dfd6c282aca68764123533bd023560031ac9b65459ce730c15e636e514a905
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 18388 bytes
SHA-256: 806df98d8139a9d9da4091c62da33fbd07e79186bd3f796afcb8e0187c02e715

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