Malicious PDF — malware analysis report

Static analysis result for SHA-256 659750db6ae63c95…

MALICIOUS

PDF

82.8 KB Created: 2021-10-05 16:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bb628d545051de11a461fd9e0dc3f4a5 SHA-1: a161bc7f0221a9c35ffbb8eb1b297e67c2e7d311 SHA-256: 659750db6ae63c951169eb2f9a38a8daa672a7e47d89f8156c6b51ca171af537
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crewmak.ru/uplcv?utm_term=colors+that+compliment+maroon PDF link annotation
    • http://pobierzplik.pl/uploads/files/99012769158.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/44468305977.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313f309da1a---39473700257.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/84d6ffafd07c2b083732c0a462077615/xezovukele.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161344beb8e19f---mikasufo.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/26251952735.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/zijanefujukokanisotux.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/51238480345.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/62502456783.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/lofijaxusolub.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/12791159812.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/burilogubefibibo.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/25554906236.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/34598604232.pdfIn PDF document text
    • http://evola.it/userfiles/files/muxotosulagozezuwape.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/fawewonugib.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/14522875081.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/77024687627.pdfIn PDF document text
    • http://tenis-klubmoj.si/uporabnik/file/95054808922.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/87266388663.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/93997074902.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/lotasideme.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/81056316499.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/15446367569.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161359b3feb397---88581755518.pdfIn PDF document text
    • 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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 10672 bytes
SHA-256: 2771693223d41ad6e766dff1ec854d28d5583390771f85ffd2a9c378015912cd
font_02_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 19036 bytes
SHA-256: 7ed9a40b3b73d2e0cee790214a2f943857428a0bcda8b0e626858df7dc6e41b0

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