Malicious PDF — malware analysis report

Static analysis result for SHA-256 5617495bc9839d03…

MALICIOUS

PDF

87.4 KB Created: 2021-07-17 18:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 982b4a1a868a89a71546df8e98a74b55 SHA-1: a8616cd48683d7b2fe68d53e95cef1dd06b82bb8 SHA-256: 5617495bc9839d03c804859c30762ec76178d834d62f19ab3d0d6c6d35be3a36
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of external URIs and compromised CMS uploads indicates a phishing or credential harvesting attempt.

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 https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074495dd4f8b---bubad.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34e1a756e---28792213548.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/93488855008.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/fejubinopagatu.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/gifosuragipevoxudixis.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/gabekapamemat.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kiwawamaxuseweleko.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609da28bf2a0a---tumoxonusotulun.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/56391526153.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/zifomapajogug.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3b3289e0---fuxikotiserib.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608526c47d33b---18153787878.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/21167056095.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0d4c0f8c2b709242323567b0ed7242d2/9321075017.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1931a6d49---rebawowavu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/l225jpk363e9jc54kqpsrb9o2a/joxomeledoke.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/kizadiretabalonavimazebe.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/37383567041.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/wedexatapofoxudabu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/dosipunidisatiwe.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/010a19d387e15522ab36d3c01b8f32d2/75333844668.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/debozigirir.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6fd611f18---jugamuxelon.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/90122781356.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd0e449502---69172157574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=explain+read+only+memoryPDF 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_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 10484 bytes
SHA-256: 5f4fb178a1b84fdd7dc3e271d396f9c4b8784b83e1a61e60e81fcfdb7c73a29f
font_02_sfnt_off0001242d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242D 16904 bytes
SHA-256: 5e14b85a2bfcf706e5b5baebdd1b6a6758567e33ad8a8492e50ea2a056ff348c