Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec8a65193aa9b8e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 05:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4162a33ed1a4e34534b8a54d78ee846e SHA-1: 300f9b1feebc525f44dc0dac7d4a7c495be9c1ea SHA-256: 3ec8a65193aa9b8ecfd9e86fe6a85b6e99c1bd0bad0205a5bf699627ad6469a7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites hosted on potentially compromised CMS platforms. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160759d54edfe1---tejuner.pdf In PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/2998823683.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/65eb518de25999c785c1eb12e10215b1/xinejepira.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/gopodow.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e42e12fa48c3dfeb63309f622413142f/ditafemesubakapu.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/59428335016.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kexulizakatuwaridimojotak.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/99944860131.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/66302425282.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/53157f73d51db8b939c378709cca970e/wujuxifeluruguwum.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/77909565682.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b627c7a055c---37488761400.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/latisudubopemogasilutisij.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/butowufafex.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/26133414127.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/23682428470.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/kavafugigaxoreru.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/67346439197.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210625/210625194825509295r0s5nnesk59n.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/remudopovixibebematirumig.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd5ff39a87---62833883800.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/99445266896.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/pavol.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/suretakufodizajuwov.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611574e43c224---nafonunuguzapo.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/fodisesasolopikef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=xanthan+gum+cp+kelco+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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 10908 bytes
SHA-256: 931347617cc268f49b77cf8e316197554bb90d88321b052c8524fbb83ab850f6
font_01_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 18228 bytes
SHA-256: 06e553ee5b3d4b217f06f7f5540de251e28573c7ef1a5f8f4908c8d5c6140d81