Malicious PDF — malware analysis report

Static analysis result for SHA-256 65abc17cbd105b3d…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 18:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 452c2205e7446528fdd9dd7b0ece8978 SHA-1: bbc5411ea0883f5ed69602d51c0b069a366abbb1 SHA-256: 65abc17cbd105b3de3b4e4742f1e38b4d343ca66b8055ada8681ffb848bf95d6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the heuristic firings point to the PDF's structure being used to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://espiber.cl/images/uploadedimages/file/43006834313.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/degofotumuwulowa.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/37280791320.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/vgs8o08iujel0gmlljlfdmnk2h/jabogeb.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2v8ir3g529ojcimd372als2nbe/17900236100.pdf
    • https://bandai-k.com/userfiles/file/14411446610.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9cj1el2uolr8bpvk6qdh3jl0e7/gofevividarojufonuvev.pdf
    • http://knuhpharm.kr/userfiles/file/20210616163702.pdf
    • http://ateliergermain.net/sites/default/files/file/13692973903.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfb97af9f---vodexelapunevanafuviw.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5221a6fd---febemilo.pdf
    • http://rajskiewakacje.pl/userfiles/file/97406789225.pdf
    • https://steklo-shik.ru/userfiles/file/gozepakikasuditin.pdf
    • http://trendybiz.in/usersfiles/file/25779048312.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfdb6e4cc1---zumevelevi.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc4fcbf1f---nomivitegejakabawo.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bde5ecb55---nigibive.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d574d199b7767931123cd55c4c80a972/jigixupilopegosimawi.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076407300e34---35031589242.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4881d4bd---53762709968.pdf
    • https://airshow-bg.com/file/rizaveguj.pdf
    • http://el-master.ru/userfiles/file/pupojiwavimokazibodimif.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/h59jvporrj4ita2uopogctrfim/82683342361.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/47c834eb1e967ee81cf0730a0a9c9bfa/sufogo.pdf
    • https://acrgroup.nl/userfiles/file/rolenepes.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/3v9fdgh32ccjfnos1c9vdqqo18/buxovusodimefavudanoleziv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+unclog+printer
    • 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_off0000ef0e.bin
ce4288c4a5612ea5d823577e2be2d016fa37cc3c64a65f7b4e12fde638c2f72c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 10396 bytes
font_01_sfnt_off000106b6.bin
422a274569c5eba3ebf1094e722e87041ca2d905556ace3cdd8c2c47b0b36681
pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 16956 bytes
font_02_sfnt_off000132c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132C8 16792 bytes