Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5e6053da0be490…

MALICIOUS

PDF

73.4 KB Created: 2021-09-01 17:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12de835f28d202839bda5f74aae2c7ee SHA-1: 9fb5eed6b0609964c938ded42ef4128832bb57e8 SHA-256: 0b5e6053da0be4901d35b10e81026054e35260dd2bea09d503752e382662ab15
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The primary attack vector appears to be users clicking on these links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/scrheav9rf5as1vqmfcvdrdbnn/josonidatevuzenomipa.pdf In PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hca53ki01718uv9g43vfml48q3/27092527653.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fcdf5cdaa---lewubeso.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/tuwadewin.pdfIn PDF document text
    • https://castel.ro/userfiles/file/94666073012.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc8bd8355---vukulawek.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/89825404390.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611df89061936---mutinugodaketefajofu.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/jafovofesupafunoje.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0be50429e---bixelakedog.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/568aaa95a9b821158b042ef61050a6ec/65534124621.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/86433533550.pdfIn PDF document text
    • http://sireny.net/share/files/rovobega.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a099eee56ec---teroki.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/d4195df37b6f72f170c5062ef0d61312/gowujomitasidivon.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c9aa59d1875945796832150749b8413a/24404900979.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ng8lro23ftnelm73fkr791t9v6/33790168772.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad6a46e79d---78145703271.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/rapunaj.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0eb9ebe6---jimuwezudisizarenowe.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087939b0d4c2---gujelojabekufivux.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/guwobefivunujutozegutu.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/15009918357.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/45500273509.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210807/file/bexaruweni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=search+an+element+in+a+sorted+and+rotated+arrayPDF 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_off0000bc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC78 16292 bytes
SHA-256: 57bdb7539637201db5548e0e7c779820ea19187d2ea01a4d52802f0693088f33
font_01_sfnt_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 10824 bytes
SHA-256: 7579418f827d2aa968b0a99f1feeb76025813df17ce7c70fc840fb3cc4436005