Malicious PDF — malware analysis report

Static analysis result for SHA-256 38af5db4020eceee…

MALICIOUS

PDF

108.6 KB Created: 2021-07-23 01:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0717bb7894b9f53ef313fba64e6a88e9 SHA-1: b04ff78b435757a9f87bbcbc803bc7553418182b SHA-256: 38af5db4020eceeed75ed101986670da12fd49f7fd82063da2f7c3ba970139ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608758fb5ceb0---5325167058.pdf In PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/jatubuganumugofiluzado.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/7206099794.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021070202052097.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c0a76145c5a5327888686b3ef00a5360/89705908472.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/69758398881.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/temagi.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/lvdcd9c3bge0gkagtarc697r6k/65959994604.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/9b9de13828555673ebe622b2726a78a4/majupavugowikepujawepef.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/nexesej.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/rejutonumokiremogulir.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/46163139136.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b7bb3307---pewasavuravadosefavonufo.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/38444132918.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5e08db23d38747f7b63c1a64d0b3576/fibule.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/tawebopum.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/76705565932.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/spub9t8jomjtp70pmcsmvh6i94/tirotumuwumumubot.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/tonunujibuluropamiwif.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/lajaxopivukivejaw.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5a28e545f5981e217ab094b8f66cb82f/renikelozanosunaribon.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160999071d060a---51344971938.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/ruxofopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=seth+meyers+monologue+todayPDF 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_off00014599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14599 10892 bytes
SHA-256: e0cfce83a88befdf7e4a3ca6f30b468e29dc20483cd406c68597fd3e5c4cb5ff
font_01_sfnt_off00015e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E70 17508 bytes
SHA-256: c58661ecb5a322dfe0027a3a25341b54e59648294f33219a67296dcd2d3bcebf
font_02_sfnt_off00018c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1