Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0a92d1c5dcf12d…

MALICIOUS

PDF

93.2 KB Created: 2021-08-12 12:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2be6f7dcf8468925a98d89ad44794458 SHA-1: 42b244fe73a7b3493ff00cb5759e52afef40d985 SHA-256: 0f0a92d1c5dcf12d4d93e610767617a0fd3104b6c3bdd7f263122af0b560a0a2
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters in the URLs points to a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://laborke.ru/uplcv?utm_term=cours+droites+parall%C3%A8les+et+perpendiculaires+6%C3%A8me+pdf PDF link annotation
    • https://arabacioyunlar.com/calisma2/files/uploads/kigisi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985579b105b---4971204371.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6amh1n2665n752br7feb026bf0/14062740886.pdfIn PDF document text
    • http://ahchala.com/img/file/teribuwodiwewofudam.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610afe3b776ad---kojeralumorefo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58e54594b3---rapupisalenok.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b17da7ce70---sitikomizojowo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ad9702d76fceaeeed49aeb52e61f8c47/wikakurubezerinuwilib.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/21684019268.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5f646b55dadfd9c55dff5516380e4029/lagaxolewuxenidulun.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/belased.pdfIn PDF document text
    • https://istanajp2.com/contents//files/68722936084.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a431e904da---sowapasupososav.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/36951917010.pdfIn PDF document text
    • http://alltechsro.cz/files/34354128669.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/67769413609.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ada58c27d---69938658897.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/wozizenobumejaz.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/tutigarevinajonoli.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/57616729405.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/pavusepelakuvafubo.pdfIn PDF document text
    • http://metall-press.ru/files/tevalimavexufudupetukag.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f2378796---43020480616.pdfIn PDF document text
    • https://beaszemin.com/files/kedategatik.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 18084 bytes
SHA-256: 88d0777f0cacda6710ebaffc539421b21c1efb6824e69b5d542237a4b08f28cd
font_01_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 11236 bytes
SHA-256: 8c903d33b9cbfd552354eeec99c06bfc7d91593101a9aaa11fe0a2e2e0068fd0
font_02_sfnt_off0001362c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3D 16100 bytes
SHA-256: 6b54a3f50d1a413a5c8c0ed289a9c866e37e8bd73df0b162fe7132700ce54c18

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