Malicious PDF — malware analysis report

Static analysis result for SHA-256 0747a49202d60c15…

MALICIOUS

PDF

101.3 KB Created: 2021-06-25 15:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 575069ccd3d2ab44d340d47e86768d3b SHA-1: 303a26330e77a0f89186733f8d7662d3b7d1a47f SHA-256: 0747a49202d60c1511c6335807402d14e57fe729b14ac1954dbb26c585513f13
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, identified by heuristics as a 'link farm'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://szymonadamczyk.pl/uploads/fck/file/19585316472.pdf
    • http://deurenhanger.nl/userfiles/file/36401856286.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a68b0fe1---46846136716.pdf
    • http://fautographie.org/images/userfiles/files/gedovoguxekobuz.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4aeac3087dd014515610358052e505e9/dogimevimigegewi.pdf
    • http://ithalattagarantibelgesi.com/resimlerfiles/15709362041.pdf
    • http://geasit.it/userfiles/files/92539237663.pdf
    • http://myucmas.com/userfiles/file/levuwe.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d49603c5c---42909030939.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160708f546bc1c---4229965939.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c26e226a7382327544fc6ab0bd0ec8a1/luxiboxidugixus.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160caacc62d66b---17395899983.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/debebumuvovowupu.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/msr97fd4gv7849ug1k1o135nbh/dumavakumuduzadola.pdf
    • http://vattucongtrinh.com/userfiles/file/53877256040.pdf
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/414313119.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=personal+injuries+word+search+pro
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001279d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279D 16792 bytes
font_01_sfnt_off00013fb4.bin
74f1597f6749939e92a1602bb43aa5e187f271511db44334bec411bde76cb6cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB4 10832 bytes
font_02_sfnt_off00015898.bin
2c4328611be715053feb6ed4d1be5141b06f3963e00b31b57a42830227d9a3b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15898 18288 bytes

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