Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a90c5e25edcc96…

MALICIOUS

PDF

70.9 KB Created: 2021-09-09 11:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e44c0bd26d33aaedaad83454c2b72f13 SHA-1: a5fe711496a0c1e9db25317484351bda80cbee1d SHA-256: 19a90c5e25edcc968c75d53d9d835ddbe8416816e75f120ccc56b8a4d46197a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of external URIs and link farms suggests a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=words+starts+with+ad PDF link annotation
    • http://qiuyutv.com/userfiles/files/20210904023814.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/wewameruvidu.pdfIn PDF document text
    • http://synphabase.ch/upload/file/julakitowel.pdfIn PDF document text
    • http://didula.ru/img/file/debogawigizasarunirobiden.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/54750619532.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/40006491296.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/51493334368.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/siziwivixikilepewerimitor.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/56214635555.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0da60778---gabovalaka.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/tevazavebodufenelip.pdfIn PDF document text
    • https://tcremich.lu/files/files/bawexaze.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/tuxizonafedewejalas.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/komarolisawotasub.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/radetonadosa.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161337133d6aa0---1667004337.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/af237d580eca59e1635818ef1c02ed63/luwenomupera.pdfIn PDF document text
    • http://zaiger.ru/img/file/zosev.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/tatetikizogivudafonigin.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/biwoponuwas.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/51366149153.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/18815915503.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/rakimekejutasi.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/nazawexigajosuzutogunefe.pdfIn PDF document text
    • 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_off0000b6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B8 10144 bytes
SHA-256: 21413dcb6be01e9a9ba89ae9dcc9207f30390e15e77dec07f3b9c57762583268
font_01_sfnt_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 16100 bytes
SHA-256: 175972032ae0699dc4f12a34cccacc6ba676460117ef013cfd3b74c95ffdad33

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