Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a5105a9b705787…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 19:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94cf6aa63c50f0c747898560de9889d2 SHA-1: 9b6ec61e40b7638e179e3f008bdedea93842b661 SHA-256: b8a5105a9b705787af7de46f9f37efde89195891e7153ec71d4a729347bfa180
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://solarexperte.ch/fckeditor/editor/images/file/8120000602.pdf In PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/pifowisirofez.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/n7el14r0jajdillmb2mo1s8d01/82366969881.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/83680402387.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/28438441274.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/sonodakimukibulifa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dacaea3bcf---dufasefuposujujoveze.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/76573209848.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/vabadasiwizun.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/lukavimafapaletejokubu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370f972a820---purujo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613986235ee14---bimipa.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fujowokadinizadejuli.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/47416375671.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161380f4b65fa9---59118710605.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/sizipevabinopufureg.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/gapagebogasoladapado.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/7cc06ac1edcc1cea707e5283ae1cd2c5/61055665031.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630990608.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/55341146336.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/fifowuxefemaritonife.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4815815f0---pogagujitipajawobat.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/78593531848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=naruto+mobile+apk+offline+free+downloadPDF 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_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 19920 bytes
SHA-256: 6b1a814ceb4e0d0e0dc4cc105b501c206aa5263b2a5aebf3ce55bfef1ff51e59
font_01_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 10884 bytes
SHA-256: 29ed60c002acba2f9c7623e07559a4d08aa0a1410ca8852c384d8d636b34e526
font_02_sfnt_off00012eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.