Malicious PDF — malware analysis report

Static analysis result for SHA-256 450445df9efee7a7…

MALICIOUS

PDF

90.7 KB Created: 2021-09-16 03:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6a35926a11a422ea8c58c81ec5b299b SHA-1: 0b19d58cf40f357e00dc2879d8525b1a7b6721af SHA-256: 450445df9efee7a739c02c3980ea05614375d91baaf71511044e48bc9411bb45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being distributed through these links. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=padman+full+movie PDF link annotation
    • http://3q1p.com/upload/file/21091322125764850120pa2la3yxe9.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/58063c065f3e5eb3df4dfc45ff582546/77338629040.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf242811f7ac123b0fecdcf83601df24/27566996886.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/giniputubozowelejamofo.pdfIn PDF document text
    • http://szwygs.com/upload/90416584012.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/sodamenoxuxezofuxelij.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1e3725a82---tunapilekif.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400fd5cd5e9---95777931175.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/73071437877.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613505f479f5c---45043861714.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/pakaponikosariwufifu.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/23996296525.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c787ec2f6c---xetepasusurewonodox.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/61901578041.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/regorakeroginosalo.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/44890204861.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/2525817716.pdfIn PDF document text
    • https://frisch.ro/files/file/fevibolilufufetokamox.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/wokejirefopixutanomuxe.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/46444764153.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/tilaji.pdfIn PDF document text
    • https://kvzriu.org/images/file/xuxofupanatuvuwuvamowepox.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/zapawogusijigubamevizesaj.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/riden.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/wodilevarojan.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_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 19920 bytes
SHA-256: d25db6828370b87714ddf89721af933b2eb68d1f3033b993f7991083773b210e
font_02_sfnt_off000145c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C7 10316 bytes
SHA-256: 4d6b6d016a77d4b590eae83c2873d6792ffdc4d0a70de9ba2deaa0414ae4dad5

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