Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dc15e7f987047c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 13:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b18accad06393911bbeb7b30ab6ea944 SHA-1: 111ad5bd45861057f749005034f0962231455b48 SHA-256: 38dc15e7f987047cc4fe45e27697957bddbc0eb860021f826d18a050bff9720b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of 'utm_term=counter+strike+cheats+pc' in one URL indicates a potential lure for gamers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://domesticsolutionsagency.com/userfiles/file/65543836791.pdf In PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-13/20210913190226545941.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/nusujaf.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/93573280725.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/gajoxowugozuxuzosipogal.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/wigojeritetolosovonufi.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/23312118355.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/67817907387.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/14016795059.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/28660203560.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/46523137827.pdfIn PDF document text
    • https://webhosting4.net/media/file/komovojidipebufame.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/23736871202.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/65390057958.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/dumisozusivesege.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/85363475212.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161323c657e45c---83820580878.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/bosolowukomogupokejidi.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/wotexowubipewikinu.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/pulokesutodasozavigekog.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/reeif3le9p5ir8r29n3tksbmv4/83414463021.pdfIn PDF document text
    • http://metabolit.ru/files/file/70147014393.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/3653972509.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kolujili.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/junejidudodegawubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=counter+strike+cheats+pcPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/54b5f475e3d32d3ffea9a7d395c5477d/28873761180.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_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 18604 bytes
SHA-256: ffea134d158724519b71e57d87ee12faf6c0658d52bd78d6843d88fa66b519be
font_02_sfnt_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 10648 bytes
SHA-256: 32a894d695067da80b17bd675983cbc5a75b02d6121c819d961a5ab96088876e