Malicious PDF — malware analysis report

Static analysis result for SHA-256 8516b67e5696376d…

MALICIOUS

PDF

100.4 KB Created: 2021-09-02 20:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7f0de33c9f31b6512d86f7a560791b15 SHA-1: 369b197bf72acc471c65d40cdc528e1781a0d21d SHA-256: 8516b67e5696376db57b0a22a6ca2bb71db1954be98832fa6a3fd70d983db549
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious content. The primary purpose appears to be redirecting users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c5cc070c---34200844611.pdf In PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088945e05054---xefisizibanu.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/75328495289.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/69461247712.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/nolexijate.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/13195168169.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5cd484e31c114707eb80f895c691eb58/wotosebifo.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/vadumilupigirelikare.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080213c1505d---95553762099.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc2f4f10778---seronelemonidiwoditelobuv.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1410929c8---30329937622.pdfIn PDF document text
    • http://esteel.my/userfiles/file/3906464057.pdfIn PDF document text
    • https://medius.sk/userfiles/file/didosafonijugemom.pdfIn PDF document text
    • http://teplospectr.ru/images/files/mawulukonativoper.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/xojareselerizekuwafib.pdfIn PDF document text
    • https://ottopianos.nl/files/jidapowemezubaf.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/22075679111.pdfIn PDF document text
    • https://digireg.se/upload/bamalonorafuguwer.pdfIn PDF document text
    • http://fourfoods.com/images/files/73396201809.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846bfe30a76---gafuxulexa.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/343de02cb83d6f09ad6d607798b2bdc6/virapuvifitufetajov.pdfIn PDF document text
    • http://www.polni.si/Images/files/501514884.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/64cdc4b11caae2b58026bd5d72740583/xexejezakojar.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/24059824873.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca475d9dbc1---roxogonevozajadetaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=downy+mildew+of+grapes+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_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 10944 bytes
SHA-256: bcd5bc53525a5454c4b304d680db1a198a9080018544e4c9391e086340cca878
font_01_sfnt_off000138b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B6 19620 bytes
SHA-256: 0d3524983ea796d73a46ff6e0501c65e41508af14630d7c5e79150cb05f4dcb5
font_02_sfnt_off00016c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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