Malicious PDF — malware analysis report

Static analysis result for SHA-256 6545b01f85e31b56…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 23:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec66e32a23ee6d1bf4a371e4ff250dc7 SHA-1: ff6a3f188e61eaf9f82fa560987dd6f62545bdce SHA-256: 6545b01f85e31b56a2d939722ebd467ad59c6e05cf9dcc58e33736977ecbd657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for malicious redirection. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The embedded URLs and the nature of the link farm suggest it is used to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3159ae64a---zufosowipivez.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/778489606a13d362612e435eecc119a4/nasaxubamafat.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/xalizada.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/roturokizuwobe.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/hjf48454lp3j4c8slfavot6og6/76529734306.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/tnrjp4us7qf1tp65kp6ici16r7/vufubifovewelupinagoponop.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/fimekikabogojubob.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/54731506909.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/tasanif.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a91fa480ec0---58268837200.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g83rujtbhupnueu9sr7soou7nc/56400979611.pdfIn PDF document text
    • http://euro-ex.com/tobej.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/12107412698.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/30440480782.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/zivekisotosegig.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/fapuluto.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/24071067535.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/91128f3515d87df987b22aabc3c85f13/gifasup.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44149e9494---28807423709.pdfIn PDF document text
    • http://mfahk.com/upload/files/18880516241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=english+to+somali+dictionary+free+download+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/20045676432.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_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 11248 bytes
SHA-256: 483fb3394e2bbf3221635da8e8db38764a3938c790f12dce853889226bb2f79d
font_01_sfnt_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 17588 bytes
SHA-256: bdfaafc70601174285d988853cc9ee0ed7151b7864908517e9cf7230c4fd69a6

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