Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaeb8a2101674f43…

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 07:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d46ce4e7ab94bac410addaa55059c3dd SHA-1: cc6e9dd8d939fdf60ab07da9e5c2ee46f5baaf0f SHA-256: eaeb8a2101674f43e5e5ca8b101dad3cb6232effe451e3c21b8236a3ad2b9226
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of JavaScript suggests it may be used to download a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k4ppmhbuds96mdtl5bvq0c88t4/kagiwudemikajej.pdf In PDF document text
    • http://sinice-rasy.cz/files/file/26425298584.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/feliganuzutexe.pdfIn PDF document text
    • https://petribax.com/userfiles/file/18780796614.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/tuniziruzexozujiv.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/87933292781.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/69273102528.pdfIn PDF document text
    • http://premo.at/userfiles/file/kinuredolipatadiwevidexel.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/12484685596.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/lanitozonekim.pdfIn PDF document text
    • https://tepihtrava.rs/files/nojezinori.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109100946424648.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/zasebuf.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/376874686.pdfIn PDF document text
    • http://fkhd.cz/data/img/lezuradoxajere.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98c560d7e---62684840868.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/nerelozewoxilufokopotopat.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/65547148576.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/belususuriwitusawitipad.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc2aa0d022---baparezumo.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/26898222965.pdfIn PDF document text
    • http://mdtrend.hu/files/file/xemawo.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/jowekuxuginalekogotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=after+anna+todd+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_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 19612 bytes
SHA-256: 538d4ff2f854211e0242362aeb994192f49a56fb55f572b5f77ab96f328453c9
font_01_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 10168 bytes
SHA-256: cf21137a622723e6124b10d8b99b71eaf3f476709836903992e71eac51d6c476
font_02_sfnt_off00013875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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