Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fd5164d20dd054…

MALICIOUS

PDF

85.9 KB Created: 2021-09-13 21:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a0a5b5b05e8fa1b4b5654a7c21a0f80 SHA-1: 913f0ece6dd36472f48af89d330b9f11d6e7a70f SHA-256: 89fd5164d20dd0548fb17412d7ec5823af75c4a12e50e5d4082e48a225e256dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces the conclusion that the document's primary purpose is to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://firsatpin.com/calisma2/files/uploads/wapiweretaregesuxepadi.pdf In PDF document text
    • http://laduses.nl/image/file/32635094298.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/54850718055.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/vibop.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161340f5b6f613---ripovudominitepor.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/pepolirepiperajulojuvuju.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-7/20210907010747115797.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/dotesetawuzonuxiguxa.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5d8c451de74fe17997ccb76503364daf/22711243246.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/tolerunasoz.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/93355864481.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/sovijevelilur.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aad2724f77---kabutoxuj.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613077ff67bf6---94438054358.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/moguv.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/livojeda.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/ripisaretasunijikajufepi.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/86376339638.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3c6f176b---15944820120.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613480c61dcf7---89518030872.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/60057964189.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/dirajikivesevukinawit.pdfIn PDF document text
    • https://0900107678.com/upload/file/25819889728.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/xoxosudanugulevofugadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pc+android+games+downloadPDF 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_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 17876 bytes
SHA-256: cb8578a3cbc15641120a4680ce5c23770f398b00828ce899ceb622bf4a40f776
font_01_sfnt_off000119fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 10704 bytes
SHA-256: ebb8e36b6f728cb81f65254b8e7973c44c2b15b093e3f74413f95c380bf63e13
font_02_sfnt_off0001325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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