Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19d1aabc0dea910…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 00:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b917d1743a2c6b55b8c3c90019c4e8e7 SHA-1: a7214b5d12620c454769d8d33014700d5a22547b SHA-256: f19d1aabc0dea91097e4df14d37c604389b042c28c7f907edf2b0d0dc0bcefc9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating malformed exploit streams and a link farm pointing to compromised CMS uploads. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.sandipmallick.com/fckimages/file/bupixakenololovotuza.pdf In PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/nivofoji.pdfIn PDF document text
    • http://vpsystem.com/files/fck/loduwerajedukusudubumix.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/83650150780.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/77441538321.pdfIn PDF document text
    • http://newo.ru/files/files/zavoxovexovoselifejote.pdfIn PDF document text
    • http://soles2walk.com/data/file/kijibisaboxib.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e13008692e---1421935112.pdfIn PDF document text
    • http://sbkf.org/files/files/pixowuvujatinebopeso.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/bidunekosu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a46ce5833f65401f45e296f3c93ef8de/75726128462.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b60a72a4244ec16d6dd2dc2b2b7886d7/10387455684.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/luximojabefagapomubasoker.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/31046699101.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/58860543482.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/39456078655.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ad532a391---16083806612.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/10061017395.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/22772921188.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/kotipagudaren.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/sexupenaxulodun.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/65918053072.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/23699874958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kali+linux+android+no+rootPDF 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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 10132 bytes
SHA-256: 4f8217c09ccb4bd7abcf6ced658a9272c205631304017e5e5d82197f956a9e20
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 19388 bytes
SHA-256: 92f851bacee6cade2fecaf42a356823125ef0588190ca2224ffc0733f93342e7

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