Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1d2853286f6627…

MALICIOUS

PDF

120.1 KB Created: 2021-08-08 22:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 671243b13649199f7e18c386e36f85e5 SHA-1: 411b31e96926b43ccfe66910892fea54c9692fb2 SHA-256: 6d1d2853286f662751597a9eaf2fe5639d969257cad53f84db51c5a114dda5ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of these links suggests an attempt to lure users into clicking them, potentially leading to credential theft or system compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=manual+de+instrucciones+olla+a+presi%C3%B3n+fagor+se%C3%B1orial PDF link annotation
    • https://hondamienbac.vn/userfiles/file/nonirugoxenis.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/befurosizizexisafituvine.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7173263a13---15266653397.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///38026900695.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/86488957360d33e7acb4d4.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/5969151559.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/zowovoritiwepegitorutix.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca406f1d63---gejogedorikolif.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/nalujuxemosawovekakurali.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/96c19139fca747a1c4018021c82e6e6c/15264872537.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510055854523.pdfIn PDF document text
    • http://armanetti.com/images/40391367221.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ecff21f09---61082579585.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/dotuzo.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-26/images/files/dugewutede.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7c18ec2ed---65239342462.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/87092291492.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/77959058510.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089703fb43b8---68765396683.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a1333ac3fa0---39400052326.pdfIn PDF document text
    • http://didopack.com/files/walexatovuvadopogikub.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608401e820d25---48940480355.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8bfcda5e8e55a1de7e5a90e5d3b51853/44966367268.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_off00016e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E40 11232 bytes
SHA-256: 62ab21c9a3a9ab67fdf57ecc3047b35fd85ba3c59e58432aa1b2ab15ce18b2dd
font_01_sfnt_off000187f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A00B 18732 bytes
SHA-256: daef3c927f4f45331f642ab32b41e9ce576c19470e94c7250bd845d50013ed1f

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