Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7d5a37fa405df1…

MALICIOUS

PDF

71.5 KB Created: 2021-10-04 15:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97636aae3a45f5ee50a72becdc09ba25 SHA-1: 3fda0e8a6350af731f502fd6a266ebd3b85ca6da SHA-256: ae7d5a37fa405df15d72f42fa69f78891aa00b08653324285547a3586524ae44
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://polesprogettazioni.com/userfiles/files/13328637488.pdf In PDF document text
    • http://studioguidobarbieri.it/userfiles/files/13842917930.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/fbe35b3f446dc74bd8cece9bfc6dd2d7/50567301975.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/wuxorelewilurewasoxopo.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/gosedowise.pdfIn PDF document text
    • http://belst.by/upload/file/vulujopekovin.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/10807915729.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/18907550494.pdfIn PDF document text
    • https://doitoutdoorz.com/file/Uailk8RRtnXNBEeZ.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/15105662591.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/dexesegu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/945e1d31e37fde0fc87567524c562b25/40093789593.pdfIn PDF document text
    • http://poiskvod.ru/images/file/40154189113.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/gafofisivufifonak.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/likisijifiwaxiw.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83723491127.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/42959715763.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/pasabexuwoxasefugaluni.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/dunemomumazarataxavesigev.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0b4f88f56---dizukizagazasap.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/movusegifililirozikerunog.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/jimiwimudoxuxefukobej.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/sojavopama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=irql_not_less_or_equal+when+installing+windows+10PDF 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_off0000b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 17480 bytes
SHA-256: e2fdaec3bbc5004d2ceda342541d898d37fb0806b626ed1e40e9dd0da75465de
font_01_sfnt_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 11016 bytes
SHA-256: f8746865345fd0bf1d7ec98eec6bcb7470226d591cbcd974873e6e088e250272