Malicious PDF — malware analysis report

Static analysis result for SHA-256 43804fa050ead090…

MALICIOUS

PDF

76.6 KB Created: 2021-07-30 22:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52010377bd766319fd0112481f36123c SHA-1: da34ec311f918777cf228ccbbd23fc522bc4da7c SHA-256: 43804fa050ead090c2d7a35c063a5d8a573a89e297c7734f8b9187075756f282
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and compromised CMS upload links points to an attempt to leverage these sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://archism.ru/uplcv?utm_term=gere+and+goodno+mechanics+of+materials+9th+edition+solutions PDF link annotation
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a8391189fb2---finazozav.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/6834138872.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ip34fme5a5odg841t41u90cr2o/66846593217.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/34c69ee5b3acb531196eeb817294a19d/petakofevis.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/ruxog.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607953a9ae72d---wasuzuzaku.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/mujevabudejiwavogipuwob.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4961a868---vaxadobeso.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/77713859673.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/bopodiviteta.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/wamizemoler.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607253e2de2fc---12185937515.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/111bb36fe5e3092977776631e89f9b7a/97221127307.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/92209994452.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/97612858164.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/zotune.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/57254449476.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/risiwobilezowubepi.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/judem.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6sk2eev41ilvlhi95r69eadhb5/fovunipinagigugosumixa.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d64396b733a9e926dbc616d5dea742c6/70282813272.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/guvarug.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/dukuzatasojidogemabuziri.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/zolevakefexulematogugoval.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/5k3pahd8tqse715ijc4abgmitd/xebotamix.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF90 15980 bytes
SHA-256: 2f4de0d6e1a6594987c7436368c8155c6daef560f3ecbb00b4f4e0dcc196ff3e
font_01_sfnt_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 11232 bytes
SHA-256: a0605ce5d65cdb475f62bcf50e9141609006297acb5fca0f5dac6740d9685694
font_03_sfnt_off00011aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 1896 bytes
SHA-256: febe4888f4320449c252a57cac97fb13f1478ba17986dc2373ded4bf28ed31f9