Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a97d19e8f1d914d…

MALICIOUS

PDF

96.8 KB Created: 2021-07-30 11:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 844fe1fa656c57e7215bbe14d149a756 SHA-1: d6a059f5e2067735e9c6894e4e0a576db6eacf6c SHA-256: 8a97d19e8f1d914de2a9f00a1aa07fbb0289728349dfe34a9e7c27f6788c9909
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/8275e8079dfe00cdf63c63b5e437b616/nejojufewitelegafedubetew.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7efb10653---xowewegojedoz.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609258339eb2e---81869223279.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/nenutoferogufirogugax.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/26f74ab48a2970f052cdb264adf3a16e/jizodet.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1apl07vie91ok3q8on3fj4gdh4/9848848018.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/jikupofinurodoz.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/pujazesugugijitefatil.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zizuvofajitem.pdfIn PDF document text
    • https://campermagazine.tv/public/file/fupowataferidimope.pdfIn PDF document text
    • http://imi.vc/upload/files/5924627261.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06964a6a04---lolabubewadibef.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6ac258a05e21af43a3f5594c7c8c99c2/gusimewipilikusoritug.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/f277d9b8eb88ab968785b582ca57ecf1/waditozinon.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf01dd7c958---kusaxewefopexurobepo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a302e288f4f1fc45d2ddfa4688a2f3a1/77766977132.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61569bee46---pakufemamezuwudelikutifu.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/49208886677.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/73220483499.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/dutonuxufid.pdfIn PDF document text
    • https://fallsplat.se/file/xisixuf.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/1477550933.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/64a69560e5b46c1913b7a53596a82409/31708576536.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/juvesejozumijubiporiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=full+movie+hindi+raid+2018PDF 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_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAA 17452 bytes
SHA-256: 279d86f044807be0b51e60b21c21a8195f5ce3b1e324c21f15135dbd251f6f58
font_02_sfnt_off00015ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA5 10892 bytes
SHA-256: ba4a50032e7f49c1011fa5e80b4ee98bde0b3db94bc88b1a76699f349a0ef646