Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa25d3faa97d1f82…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 00:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a27fa4f0153ca41b655b576e2c23963 SHA-1: f098a561c3c4005fc19ee8519f9f98cfd88ae6cd SHA-256: aa25d3faa97d1f82c0f185a60c17a43dbe7360f86a068fac4023578bc95ce518
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=cat+game+play+store PDF link annotation
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae73d1a33---wujefarofawa.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/fewujexuzugojakasaso.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109100535388691.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/73465893461.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/173463927561344d813acd5.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/82916272168.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/xaxuxejagivenunajomidu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6ee43c4e34e5467ab3a49e0598bd46f1/kirikogitev.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/t8k9ihh2ec47u6oslsa6rqffv0/45889422973.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161375fcf6b58f---53218388740.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef16ae711d---wovigisumupixeminukeput.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/96d4a6fb08b4499347e9d3559e687928/benuxojipaxaki.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/komulisokumonibago.pdfIn PDF document text
    • https://actorconseil.com/files/file/95513324226.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/85018708396.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/sijuxuzuz.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161300de36db46---xizeniluzowutegekapamuwid.pdfIn PDF document text
    • https://venus-forever.com/image/files/tegexogafibome.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/dukow.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/xuroxipeledugi.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/sezuvilifebalode.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/22017003836.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/mitir.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/68962202021.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/551430be7909219a78a1dc7bcc066410/femagudugijekiko.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_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 10544 bytes
SHA-256: 523de05239c94bc781b4bb9beb6fa566489bce879c0918364a7aa697ca2cfafa
font_01_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 16984 bytes
SHA-256: 5398759c1a7f75dd5ad298fce6e03465c5c7e90d2e1e2889fb60a47e5f198a45

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