Malicious PDF — malware analysis report

Static analysis result for SHA-256 59121dc6154dfdc5…

MALICIOUS

PDF

108.7 KB Created: 2021-09-02 12:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3485d9ba7a10bc64de85347f40e85636 SHA-1: b8c8b18c3775111d19df8daaedfba321650825b9 SHA-256: 59121dc6154dfdc52232f7a334dd968de5cc034848e6ecd0f8e2d9ee8fd8714e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The primary function appears to be acting as a link farm to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16111c8ea76cfd---7718558108.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5445e8359d3b1dcf0aa0a36999fb13b7/ruwobubezimowa.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b670049da48---kaxejutuxatikawiki.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/sofitabexozaxe.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/26828813837.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6875d5ef4499e52afcfc50fd8592759a/rididadejisojexu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aac9e3555b4---sunaloti.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb5cf2dc6---36976067753.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/20871699950.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/5so9sqbhph8mvtrsueqghhkc70/50494742565.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125beb0e4158---75606335420.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0d97e86c---11047150500.pdfIn PDF document text
    • http://secretinvitation.net/images/files/lomokojubulu.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202108212212189192.pdfIn PDF document text
    • http://teakdeck.pl/files/file/xofawozadepep.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/h6gp9oda1ljnnebodc6afp0aub/lapavosotubekefunem.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/zivegadavirogomonixu.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/bunuwolub.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/kofej.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/47653166229.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/92900586016.pdfIn PDF document text
    • http://ledins.lv/cms/file/72027222017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gender+conflict+theory+pdfPDF 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_off000141c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C3 19472 bytes
SHA-256: 214fd0fca655b1753e36a7799705a44798d5f4424ae68ebb832d999c8590667b
font_01_sfnt_off0001752b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1752B 10540 bytes
SHA-256: f2cc0afbf477277f4d80f2804a98c215e10cb2a43b70d0b6a89b5902b4888fe3
font_02_sfnt_off00018d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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