Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13ed51320318a2e…

MALICIOUS

PDF

88.8 KB Created: 2021-07-03 22:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7ccc0ff7e30c1bf25817944205694b8d SHA-1: 95e1a5646e6347b9e9fcd8f39be57539bdeacb03 SHA-256: f13ed51320318a2e576c11552d7b16a98502b18eac3343d9ed7396d3765411e1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://koratspring.com/upload/file/sikuzidipefedunufuvum.pdf In PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/poguvizonaromenuxexawor.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8f16ba16f4c98ff529d0e773ed769b2f/tusevudefix.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c18e2412---69875440444.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/1562727619.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f09b6cc9---xelemisujalapakilav.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/sijinuf.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/misivimalezibelabunidexaf.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2cec831984fce669503d175b7ffc278e/85053928599.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/zuzutariwiko.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd68aa2e126---41835897505.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/sefelulodinerepozuniruje.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77f575505---vojom.pdfIn PDF document text
    • https://defi128.com/userfiles/files/13640270923.pdfIn PDF document text
    • https://hirurgija.me//files/latelogirumov.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/minanizulakozi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b10d3f27c---baxelidimu.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/kinokurabagavevuvox.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/490f689be5b3861697a96b53a6051ea2/kesoj.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/64214412684.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f309b725---41680112259.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/97276797632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=asp+net+multiple+choice+questions+and+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 16648 bytes
SHA-256: ca03582eca0cd0fb31697af6cabed6b9de57a0bf06ed67632c82a99e305eda6d
font_01_sfnt_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 11092 bytes
SHA-256: 2addcff58845f5ee0d00a49c32cbe31783777eef4ea5c08bfc2d37b3ba04bf87
font_02_sfnt_off00013d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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