Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac594bacc24ee8c…

MALICIOUS

PDF

86.9 KB Created: 2021-09-03 14:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 281e1fb5df38ebfe916c47217d1f537d SHA-1: 0aeb8640a8584794ff875935d48f7bbb61461ec2 SHA-256: 4ac594bacc24ee8c933636cd092874072157977d97b625b5186181ede9dea98a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kmkmekanik.com/upload/ckfinder/files/zifewajile.pdf In PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10fa9d8a89---1410478714.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72659d3c04---73770853191.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/72942217654.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/94159385503.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb54180fd9a---10682640877.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/61700428356.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/a49dc547f96501ea4e6430663707688a/27426289915.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/jojoferoju.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f60fe30dd---xivinumif.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f32283aeee3---zejoxoxeruwimuroxagizod.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3edc12ea---xisup.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/70024bbbc51bf8ef469cecb7b9b7cee0/22260030032.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0312e646---ludekujowitolosaxaw.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaxejolufero.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/kasodazoxedawox.pdfIn PDF document text
    • http://iltorg.ru/upload/file/guzuno.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/45636949214.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/20100040501.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ce8d6aeca152570577c92cb66a66ba5e/89853696169.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/5096047805.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/jikadalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ejercicios+principio+de+pascal+resueltos+pdfPDF 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_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 20616 bytes
SHA-256: 318e5f97f7947579be875962f6be644f381511c8cf089c16334fad5da002e6af
font_01_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13491 10828 bytes
SHA-256: 6b1a3d7b2b2c40fb73da9a5bc6d57d249ff8cd94196df9fcd486f40f442776e4

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