Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc2e8e911cc3766…

MALICIOUS

PDF

87.7 KB Created: 2021-07-21 13:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 58e32acb7ab9ee0ace2e09c4a8fd9a06 SHA-1: 7f026cb1fed206ab6ba0ada182e31a6ad2eeee88 SHA-256: bbc2e8e911cc37667ccb21349757c40a693924877ef3301f9a16015daf95f795
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, which are used to redirect users to potentially harmful content. No scripts were extracted, and the document body was unreadable, but the link farm nature strongly suggests an intent to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://tsradviseurs.nl/mailing/images/photo/file/56208154714.pdf In PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/zosupabexupixisif.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/supijike.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/12650675007.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/6015f5941d1dc3a8537702df39d29efa/64570977934.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/29136292753.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tatugenibubivemu.pdfIn PDF document text
    • https://termofriz.rs//files/puwagofitumunu.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/basinujewizizutudowezako.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/fc3cbab6fca714ebd96b1ad75ed1dc1e/vorokefasunetexorasupilo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d25422139e0---17052854957.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2c59c879faeeeb42ed16a3400551d4a5/zobolurus.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/31445863141.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/dawomi.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/72cfcdbfb406c215411afc0ebff4ccf1/89584072888.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b3ec3aa2c01cdd22006b8540c60ed586/65572183284.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5a0a8fe8f6aa8b0200fec86406641ff2/97364307340.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0355342001619816607.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/4757330969.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/5016902401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=obese+potbelly+pigPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/73058494495.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/68998523063.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_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 17372 bytes
SHA-256: 5790c2b93cac8a4a84d7a4d573662570107ebe2aff24826afc4e25503d257f86
font_01_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 10340 bytes
SHA-256: c5d2ea7b737657a5a783a585fc754a83e635b0a4bafb3b0f049ec5db15108ddf
font_02_sfnt_off00013857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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