Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccd2cbf3ef15808…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 04:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14ad8ac45e9b7eb039d3b0c815fb06a7 SHA-1: d919a983b8b7c1440eac33594649046213e170db SHA-256: 3ccd2cbf3ef158089647680c05b0116dee9fd1ce4c24013497eb16ebe31af432
176 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised CMS uploads and disposable hosting, with embedded URLs suggesting a lure to external sites. The presence of multiple suspicious URLs reinforces the phishing and potential malware distribution 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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=oliver+twist+character+sketch+pdf PDF link annotation
    • http://flexa.cz/docs/file/koxuxarakutu.pdfIn PDF document text
    • http://demkapi.com/resimler/files/giwisanetewepa.pdfIn PDF document text
    • http://zuszdounky.cz/files/wesogamejakosuroseresi.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/41793236488.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/509b76703255427ed6c8f41a437b2127/1277980116.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021911104930.pdfIn PDF document text
    • http://strahyi.ru/images/file/sovefazigone.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/pudetuxa.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/vejimadijilinafajajagaz.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/wafunuzawuretuwibona.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/98954800748.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141e331d9c4b---90411204988.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/lopatisulok.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/rarik.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/guzeti.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/j5rvmtk45jhv9s1674gp0k36t3/matuxijerivodovevava.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/xaxasokida.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/29697148236.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109161343217391.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f46dbcc478709176ace413cb39334c73/newibadojojenesune.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/6640402088.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210909_23_21_16.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/84833328042.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_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 10764 bytes
SHA-256: 23e393c8777d5c62981419504649de749f113ff024021933a917939f94d6c029
font_02_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 17524 bytes
SHA-256: a106db7244831ebc30783f2040731cdf516dda04f2e344743fa218c4a33b53cb

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