Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4934512228e9509…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 05:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 41dc0f9bc4acdb9a0440637cc8421a93 SHA-1: ff004479d7e78f8f0b4c1f0811cec091b9b5ec96 SHA-256: a4934512228e95099e3033aef0a64290a82ae156043506027420c776e1bc5f7f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://studiosiciliani.eu/userfiles/files/96340959195.pdf In PDF document text
    • http://tfh-filter.hu/_user/file/rifasowafegejukemapuxita.pdfIn PDF document text
    • http://xprchemical.com/upload/files/libidewufe.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/kojokifami.pdfIn PDF document text
    • http://fteq.ru/files/file/kunud.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161420e0e01477---wibutakijetupere.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/2366286913.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/12687811553.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/tudufigiwigilutedegomaz.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/dasavetokasabuki.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/31853090024.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/kixidovowoloxoragez.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/mebovigusagijim.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/26584944182.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/6358690997.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-24/20210924120110179707.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/95031632885.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/jabekunosazadis.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/53015281521.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/fotitasan.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a85cc4ce7d632ddfbdda48d4fd16b476/zumefum.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/vogikujogurigejenudasazu.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/4117980252.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca67ae98d1---28759880751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=videos+brazzerspasswords+2020+hack+apk+for+android+downloadPDF 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_off0000af9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B3 11208 bytes
SHA-256: 4a752ddb3641ac9be0c01f8e20581aaedfa16f67f19d7719a32b680e1f59f480
font_02_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 16584 bytes
SHA-256: e472f8ac347e4624842f8c67f0ab408b15ef4737d68d36f1dcbb5a53eacdb9c7