Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb26696cbb088a1…

MALICIOUS

PDF

88.6 KB Created: 2021-08-01 09:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf94913b3ed65e294777f20e87df75ba SHA-1: 533894340ac17f7f9225d115f8a033b192320790 SHA-256: 2cb26696cbb088a107b7b0b854817af2e113ce4fbac3e1d1295ffd7c694035c5
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF containing a link farm pointing to potentially compromised hosting. The presence of a 'download button' lure further supports a phishing or malware distribution scenario. While no scripts were extracted, the overall structure and URL findings suggest the PDF is designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://asude.istanbul/ck_images/files/35454139342.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b12a9768ee0---70478922407.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3bf51c0b7---dewozigutu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b370f53160a---57870648745.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608118a21fb2c---poloxowevaj.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/df7a8656518c88aabee753c493640da9/57595814402.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/de56lv0eaqi375rh8hjg95e81m/53756880761.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/bb4877d37f3b978fac4c1fa731a9dd04/laxegibavu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6a608d54d5aeb3f857c8996165b822ad/bopilonujadegimixa.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/82689407604.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e1d89208---bizexipuworabutapodo.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/bijinewo.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/1969333010.pdfIn PDF document text
    • https://edarky.net/data/file/19244198916.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/33fa344726a395a3a457ac7b1a0f07d4/remegavugitugi.pdfIn PDF document text
    • https://slide-bearing.com/d/files/bawajogikaleromunazopuru.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/gosib.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/komibazaxorefakobezagade.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ec85356dad69731adb8ccce6186e2a3/92940287658.pdfIn PDF document text
    • https://poker-fire.de/file/96752812028.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/livowo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbcf886d8b---97282360814.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/62631180674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+use+akai+mpk+mini+3+with+fl+studioPDF 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_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 18096 bytes
SHA-256: 61d2aec96f65146369ab2bd6eb4d991a27aa4a33cbec23869c01679ecb1f02b7
font_01_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 11104 bytes
SHA-256: 335feafb397ccd52f2df6ca14699f1b4c878b3382c4d71bf2a4b946f63adede1
font_02_sfnt_off00013a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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