Malicious PDF — malware analysis report

Static analysis result for SHA-256 64800a0556522686…

MALICIOUS

PDF

89.0 KB Created: 2021-08-14 02:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb830b58933ed737a97dd451b7082bf1 SHA-1: 540c7a2376297c00e98123f03f1d284bf77fd343 SHA-256: 64800a0556522686b9e258f649c010f32196da5ebea1e6fa86d9d26618d5599b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to PDF files hosted on various domains, some of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pytextiles.com/userfiles/file/92648122096.pdf In PDF document text
    • http://www.knickmeier.net/images/pageimg/file/78429051616.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/49697459972.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/47738412084.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/73207590293.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/15125759855.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/spb7bjo5fusugkt4ckpp32n6sk/fenotugilafezafavijim.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a4c33a94---21200327107.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/83296811827.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c9e9c569413ec5d7d8ebfb1993556978/wanurovasiniwurosawamago.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/zigotewurevuwunekip.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13f739336f---9323345345.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/90338125301.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5347205d1b195d4e348ff605299e571d/dufuxav.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/86354991876.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/wetaminugumigin.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d57b60db4---penamifonomajawakoxuzile.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/fireluwoxuwevidenirewo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608952e8d9704---46060259033.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/najasazobevipoxotabuzotiv.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/difunutuwosodibak.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/54261538890.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/42218721131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cambridge+primary+checkpoint+past+papers+2018+pdf+englishPDF 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_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 11948 bytes
SHA-256: 7a35d106d2f563ae9b3c6644074083fc9e71698c48bf17dd71f7c45804611167
font_01_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 16904 bytes
SHA-256: 58cd6bb6539ee669612ea3a3d897909e898fcbbb6d1634f9b4512077826726c6
font_02_sfnt_off00013d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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