Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1dc6068209b981…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 17:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b4883cc03bc056c7c91ebbc26235841 SHA-1: fe8bd2afdf1c0a4f9c5e49d711bd2070372a6ebc SHA-256: ba1dc6068209b9818babee8c866db6046f982f13d9fdeba185c86cdbf7cb5354
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of external URIs and link farms points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://classofjoy.com/KK/userfiles/files/21284986470.pdf
    • http://www.chubsorn.com/file/files/mejokazisovujidini.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161117c33eda4c---webawobaleloxamemig.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a884f3684---nesigopanukeveba.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/tuj3cqrsq3o1i7hqtg9khid37m/tedite.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082fedd1a966---nujutoromixonitowituw.pdf
    • https://egokituz.org/files/galeria/files/50574678496.pdf
    • https://299-45.com/CKEdit/upload/files/munodo.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/mqp69t66vafugimjp9b5c4lu4g/fikolodalubijiluri.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ddf01c1d18625577dfb38fbd1b009c87/12158356452.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3a7d3353---40075892224.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6715605a81---9656867800.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb48c07db8---werupuk.pdf
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/61131167755.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a597d742---zofalorotobexejog.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/44265254743.pdf
    • http://aweibel.com/Photo/file/kewezubuk.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ce0a0bc1e6f75b8b0596321a7e31513c/72273957163.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917f2ca5446---xugezakorer.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/d85c394b073097d6f045525bbaed5f1a/88845825878.pdf
    • http://yalcinsezer.com/upload/ckfinder/files/3474952391.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd63797358---9170166282.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=foxit+phantompdf+fullprogramlarindir
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e9.bin
8cd034597dfeef5527088bcd499a2d8abef63cb65b7c7b0529f684130e8e1f28
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 20424 bytes
font_01_sfnt_off00011758.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 16792 bytes
font_02_sfnt_off00012f6f.bin
ac76a4cc069da26f8551bb98f0c5b64941294bbb595f9100203d058c28576a3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6F 10824 bytes