Malicious PDF — malware analysis report

Static analysis result for SHA-256 af546ca1e66dd0cd…

MALICIOUS

PDF

80.7 KB Created: 2021-08-11 04:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a81a814612d7855b20963bd70d3fbe93 SHA-1: 782f819ffa8f6c7600f404f3d1de50fa64930cb9 SHA-256: af546ca1e66dd0cd2bd7d0c2fb42fa849848b5a7e3e13d943117ff9e931176bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://medvor.ru/uplcv?utm_term=baixar+as+vantagens+de+ser+invisivel+legendado PDF link annotation
    • https://anfauglir.com/images/file/vewelisemowubogijakovi.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/95782903842.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/31553978166.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gh50t9bid57k87gmf75me8e5l0/sigugudorimiligozeluz.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/pijaga.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610257cfa47bc---42106959475.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/33090990869.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/288c6d7c71aca92bdf0fd7b967767a4a/janakejerog.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/gmb4vj734muic42kp7rd3kr801/5308160384.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/815bf830e316b0204f89dac5766b41fa/56619610390.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/s7t8cn2pbsg8af4fpfei8uhe85/55763949666.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb5ea24a2b---malazavuri.pdfIn PDF document text
    • https://people11people.gr/uploads/File/vomaxapaxoruxaligigofojez.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210712194303.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/17012136340.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607674a8696ee---75882179736.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/929krfsh7i7334m2q26cn19df8/42010316845.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/38995260741.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/79934dcb30dfd119efe8e6f99861efde/jonowilevemuji.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070162808d0b---lulikutoxiterowurogoroj.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/9fe572c63c559e23aa5cabffba71e72c/93632859018.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/zegeliwukibawuri.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdfe5ec2a0---30627388051.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607770f681b75---sijilediki.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/bugivalokeripogajotated.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_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 10644 bytes
SHA-256: d14c16926cef0629e27cc6b639271b5341ed68ed2dd3c14c3ea9c82629e8860b
font_01_sfnt_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 19136 bytes
SHA-256: 1c0a207be62afbcc3b5b10e76958743863ef2c1552e7f363eb36419688a14860
font_02_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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