Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44ab9605947f989…

MALICIOUS

PDF

102.5 KB Created: 2021-09-05 23:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bcbcf579fcaa6750f1367f57285bf963 SHA-1: c8087b9eb4286be3e98380483c5aced77c18b5df SHA-256: a44ab9605947f989ddbeb2ead980fa8faf4fc54c1d8de9d864c10e352cf026b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure victims to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://narzedziascierne.eu/Upload/file/82315405024.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160702991113e0---tefenozetadaxo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ba37915e---menubagawegubifa.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/gumomakasabuxisunalimerob.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/fixupuwunujafapujab.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9484cfedd9bfdf5b4785b716e39f47c1/kunorakireremosafaromaxa.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/roguber.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-26/20210726020446542441.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8596b235c6---50147043570.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/791c78aa30d4399a8be4f116da89decd/pisefilegakotiponof.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da100640d4---68672847045.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160881667ab3ca---70381872984.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/12559980099.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210728061100.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c2f3704661c4aa2795c2bc3443cabbed/zukixiperodugigub.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///rafunulusitaj.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/memugefobemof.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0d2e00b8a---30930197139.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/a77379c9d8de3bd11245e5650f55a444/82735562892.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/51815226410.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/defejuluzogomexipig.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/29497773232.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/zotenorowivikimepa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0hvuom9o8svnmj4vh2po095l72/pavawaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+oxford+handbook+of+bayesian+econometrics+pdfPDF 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_off00012828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 19360 bytes
SHA-256: bb6f39be8810a84522ba894c42f2ae0f3d51cd55804c24e6937b247dae27737f
font_01_sfnt_off000159c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000171de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171DE 11248 bytes
SHA-256: 1c85c7804b840191184f807d1d884bfb95185bc1024d51611b6925bb51e89a27

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