Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c80282e4881f83c…

MALICIOUS

PDF

86.9 KB Created: 2021-09-19 05:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c1d910293cb696a055cf4bbfd85d51c SHA-1: 5e32eb254d1f1bdaee86c48e227f4b469583f602 SHA-256: 9c80282e4881f83c9cde5650cca708b4bb1fb8cf70b53503187053f5b7e06db6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://chcial.ru/uplcv?utm_term=apk+library+apps+for+android PDF link annotation
    • http://sanarina-coaching.de/ckfinder/userfiles/files/nabexem.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210919025352.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146548070ec6---96434263680.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/sipabinaterovan.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/lojisobepam.pdfIn PDF document text
    • http://masonhn.com/d/files/82117732990.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210905_ABE667B12792CB77.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161469650cd244---nerovanotap.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631557771.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///sivorenewisarexu.pdfIn PDF document text
    • http://usagimatur.com/files/others/fivuloxamenewiterunoropo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137510e13ed7---28352299163.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/kujafosuzo.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/tovadubax.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/38152038654.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/53245243518.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/22284963792.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/ribidujuf.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/jugumokoseruvub.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/dotavejanawuk.pdfIn PDF document text
    • http://eksternest.be/images/file/ratebeboxabixaxidogijis.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/wogebokuruk.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3840a3e2b8bc96cd331e8cc3cff1d9cc/73534957646.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/78318913756.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/67199256801.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/dodupabifipawakerow.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/pokididokotof.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_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 10588 bytes
SHA-256: eb7111a2cea3e1c2f6c2a0db6ecd11fed9f5abe986f0c78e935881db52ec08f2
font_01_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 18248 bytes
SHA-256: 4f8801ac5d533790cc0224b754844583da25721996349918b829715e1c6ad810
font_02_sfnt_off000135b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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