Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e87fa51f004c57…

MALICIOUS

PDF

93.9 KB Created: 2021-07-17 07:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 398b0cb16c8b520e1d79627f9ef1aafb SHA-1: 49d791d804ffbeba269d03b9f76ec737f6533495 SHA-256: a4e87fa51f004c57134c61c13c3047408e1ff375b840b0e8992efd82dd037787
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1055.012 Process Injection

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple domains, some of which are associated with compromised CMS uploads. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bright-mineral.com/uploadfile/file/2021071706570746.pdf In PDF document text
    • https://topclassgreenery.nl/images/file/wajagilok.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934c210dd64---vozaribuful.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/2lhb8lfhcuv276satestnmejc0/fepuri.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd943c14a90---wopinenofav.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/80301309918.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0390eefd8f608387079dfaefc8499537/4881080161.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5550a49bc24b605226e2560b76c150a0/zokewetajamuvoduzunadexos.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfae1f28251---14781699024.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/narifagewuzuzur.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/68425277585.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/belawefenomaposugubunifib.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/6t8u2fi22iehmumeju45vvuap1/kexuwokuzixesobi.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/vebanizopejodolobimonoruz.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/wogesaxogaweruvo.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/59568775934.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa19325549---vuparerulasajux.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/25450158743.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/571204f65e7f4cb689148872aba18899/56883920612.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0dd2e143f9e26faeae1bbda12fc33b9c/dafenus.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082831a3afc3---pemupeluturow.pdfIn PDF document text
    • http://foodchemsino.com/d/files/daxugijopipejobilofa.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ed6bc1c1a5341cfa526350244eac298d/debisuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=worksheet+on+motion+and+measurement+class+6PDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 10988 bytes
SHA-256: 478e3d71ba2fe7363ac4931a16562f0cc0e6cd5479239b84a770bcd8bd44dec1
font_01_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 17888 bytes
SHA-256: 93af3718ca94a12261134827da075f5d06f63bf0b6f13d7e05d0d1d19ab9d985
font_02_sfnt_off00015238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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