Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff70861daaca5c9f…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 21:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15752e5c8c6fe87f97eadcc462179b47 SHA-1: 08670956a9b65fd0798c71b9a097da06a90f713a SHA-256: ff70861daaca5c9f933f0a2341179e2178b476fb71c93ba26859958d65b231e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to compromised WordPress upload storage and other domains further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ganteltechnology.com/system/userfiles/file/zonizewaja.pdf In PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/pomapuwixosopelawap.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/lomonuwetivijotedube.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/redinunamosexuzude.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/25776914518.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/83248813506.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/28339407662.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/sozodagegujoxumoz.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/42244790818.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/29594166031.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161344bdb4acc2---74963233696.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131624f10542---66346239107.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/kevovewaxasujoxijiforep.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210906150334.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/kuwiwag.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/vopasixijurufizun.pdfIn PDF document text
    • http://xsteelstock.com/d/files/jelikavesado.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/viketu.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/90402520614.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/dobewevaserajupin.pdfIn PDF document text
    • http://letdentalab.com/img/files/38617903427.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/77178506593.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e928f9b2---jimubav.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/tigat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=portrait+of+a+beauty+full+movie+with+english+subtitlePDF 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_off0000c04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 18372 bytes
SHA-256: 52f9e9c0d623546a463cadf17d20e5291c72c7fd98e0276dcb6d128fc7953539
font_02_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 11168 bytes
SHA-256: 5467feacd26f2edba3cffc99f1fc5b5301b138a80dbb3e179273a670d8785fb1

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