Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a351a1dd6efa142…

MALICIOUS

PDF

86.3 KB Created: 2021-07-13 18:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd1cc690efff43b9af97eaabc255dcb4 SHA-1: cd731524d094a8e8191cd6b21704eccbd0571f37 SHA-256: 4a351a1dd6efa142399bb329ee624947693cd231ad94faebddfa990aada753c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57cd2421ea---78857441685.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e60b2c56b1---burunofodaf.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b9d5e22c---kajalilazebem.pdf
    • http://alpha-cp.com/userfiles/file/visategud.pdf
    • http://timandlor.com/userfiles/file/kuwugi.pdf
    • https://99shayari.in/userfiles/files/zozizi.pdf
    • https://aiaciran.org/cache/fck_files/file/38156340091.pdf
    • http://azbuka-d.ru/ckfinder/userfiles/files/zakuxidokesolofujop.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f7d9272866ca67c46344418b1c912ca7/nasugetunulopetuxi.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9kc1oj4iv09qljt2tvbldhvv45/22089010346.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d45ee636749---mirakate.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d779f2389e1c2a8693a6d964da3b48b7/sijuvedividaluditer.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cjsnh3k9jpf1tfintpq3jk9nm4/dadewavogap.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ee18d0b508d187a16225f94e7c92444b/tapovane.pdf
    • https://efnnma.org/files/file/nevubutekibitiwifizuradod.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3da593b3a---3966373506.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/gefuxesovis.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/93144390089.pdf
    • http://jfkanacon.org/data/userfiles/files/84370514284.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gudetogibitivurized.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/aggookutvgv16p7t869btoqa9d/ximolufusutonowofaxe.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828c2541887---naxifelekos.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+map+legend
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 16792 bytes
font_01_sfnt_off00010b03.bin
be60e509a95845587e849a43a384effc93a68e705da283d4508465014f883007
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 10224 bytes
font_02_sfnt_off00012176.bin
f1b734d02d8564f89b79c4e2b660ff8f01f71763369032556e8a3eefea472f68
pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 16532 bytes