Malicious PDF — malware analysis report

Static analysis result for SHA-256 49384d831b355f3c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 05:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57838ad2a73fec5b20ffb3d41bcbfb5d SHA-1: 8f5563dfc033bf5447be3886d6e88d57064016c2 SHA-256: 49384d831b355f3c290b2299a06e6412198667d4a8334c6ddcb62533bc95ae40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple link farm heuristics and unknown reputation URLs suggests an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laundrybyconrads.com/nbloom/fckuploads/file/86380574294.pdf In PDF document text
    • https://devcons.org/uploads/userfiles/files/36693993313.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/47031726289.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/rupedileridu.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/goxabawiwexunugo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132277f30c61---99964818973.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210901055400451066.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/tasumimuzitafigedefobu.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/rebenafunisirapo.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613172e966fc7---kilidapux.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd48cea37---lokadaremixaz.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/teridumup.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/81262091793.pdfIn PDF document text
    • http://bdsductri.com/upload/files/53253509743.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/xapeweroradamevilazo.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/19906579504.pdfIn PDF document text
    • http://citty.org/images/uploads/file/fonaloxatamibopomo.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630935312.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161349328065e4---duriwixudepelibalojedosa.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1me4r5oeemf6a5hcev1vop64l2/55238275101.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/21164342879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=leopard+seal+life+cyclePDF 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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 16768 bytes
SHA-256: 803d745267ac5ac0452fa402b5cb1bb20b2c991db27e6485a846afb5de6bf0e0
font_01_sfnt_off000102a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 10480 bytes
SHA-256: ea353b8b60ee90ce5dae2c9055e8dd839ee3c013abd73af32450aa3367ae9de0
font_02_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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