Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdfecf686218bca…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 05:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55ffb8db34cbe5b3be8ea45682dcd60c SHA-1: c1e13ae5c1b82012bebbe444cc4f0e251ff1c0da SHA-256: 9fdfecf686218bcaf228d90a656b1d7091a5fe39fecd01055f71b9939dab2a37
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous PDF links on potentially compromised or disposable hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://matras-devison.com/upload/file/womuk.pdf In PDF document text
    • http://olympicburger1988.com/uploads/files/danisuzabu.pdfIn PDF document text
    • http://debten.net/UserFiles/File/xutorirotidive.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/19203318142.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907210956642452.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/46853353423.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/99482079499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5c1c3ebc---sobegimu.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/53512199653.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc555bbad---xeguladixosesolikapasis.pdfIn PDF document text
    • http://innotack.com/userfiles/files/31513756317.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/fedegarowere.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/pebetitevitaxok.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/85080800218.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/bopirazijevopu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef80e4bf0d---28316131019.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/vobumozaj.pdfIn PDF document text
    • https://insp.biz/img/file/rakal.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/6986726957.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/bb4731469c89785e061ed786d9b7d47b/43996058714.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/dofirigogozupidelexi.pdfIn PDF document text
    • http://askaudit.ru/price/34811700182.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/12/file/20210912_063630_134.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/49060754381.pdfIn PDF document text
    • http://iwort.de/userfiles/file/94657251168.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/s43lm358kobutkrq51gkm0vt7l/zijofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sweet+selfie+apk+download+2018PDF 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_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 17600 bytes
SHA-256: d471b25bee12a235c56f4fb72155a5d8ab9830037bc976ca0ae449fd5e5c1b26
font_01_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 11148 bytes
SHA-256: f53868c0a2eb6430339022a4f64f2f12a6e7a1a354a5b20a166016463a6dc0bf

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