Malicious PDF — malware analysis report

Static analysis result for SHA-256 639796767b9ea3b4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 00:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5262be8e497b2d2dacb3751c56921fee SHA-1: 73e01c9d549698dbd063d327015a9facf027f6b1 SHA-256: 639796767b9ea3b4acd1836b0e0406ebf22b62a1f362fa5554164a8e98963b41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various compromised CMS uploads and disposable hosting sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely intent to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://prograsifkalip.com/files/busupag.pdf In PDF document text
    • http://eventclub.pl/userfiles/file/gizunuzizamezar.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607429603ab26---45578048458.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/b938133bba04e2c77fc2678d38a86c39/bubifirukeb.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/47668210951.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/12962862741.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/98542050412.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/glt3hjog2187jjiaaab5gd2brj/keninigugabejexotukizaxe.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/51036614911.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098321ccc680---xekuzizarujixuvazoxobi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a248a1d5ee1---bosotifisekok.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/13078387033.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/69488072792.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/febutodivekujemop.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/826221460.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/82531f214c62cb400f87424860c5e7ff/kedoweseguvaj.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba21c411333---kezamupadizanejob.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/28511897320.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/47335239797.pdfIn PDF document text
    • https://mfdesign.hu/files/file/56026316616.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gojef.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/15073230762.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160e09c0340c59---mijipini.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/linopoderizodana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pronom+complement+d%27objet+direct+exercices+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

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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 20144 bytes
SHA-256: c5bf18c275ba28a55e044e40e90447f4f7aca257ad8111d4cb11a959ddb33900
font_02_sfnt_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 11028 bytes
SHA-256: 3ae1c66d300229d797cc62f457cab88c0f6f8906c4bd02c8104308612457bb64

Open this report in the interactive analyzer, or submit your own file for analysis.