Malicious PDF — malware analysis report

Static analysis result for SHA-256 640bc4d22e2ea37e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 08:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8b463119f255dccf4e704342ce972ad SHA-1: 2ffa8bbbcc7684d1657d9d95fea80550e092bece SHA-256: 640bc4d22e2ea37eaf1d5578f0492ebe66d29073ac62289cdae15fa176f01523
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of numerous external URIs and link farm indicators strongly supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://philabc.ru/uplcv?utm_term=snaptube+old+version+2019 PDF link annotation
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9ee273686c8005e959b5f693a98118d9/55849304235.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136497eeec64---najaleguwibowotinepuwizu.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/javivesafenidukojozixawe.pdfIn PDF document text
    • http://bamila.vn/luutru/files/77201845878.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/bogidifoxaxopog.pdfIn PDF document text
    • https://krossi.ru/images/content/files/vedidelofunatepa.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/wotejoxabir.pdfIn PDF document text
    • http://trivio.it/userfiles/files/pigemosoxagurawomiko.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/14815505636.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/934f3d8f6b212af4726b84c3bcf316a6/25518889400.pdfIn PDF document text
    • http://www.siposferenc.hu/html/40532946818.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/322a1407304998460aa779fe5b506273/33167738540.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/tikevebulebalagifeva.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/rezadodiriwonomadapep.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/92669669354.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/72651886105.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/busudexa.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f273e48e06---48706396257.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/nifojojularujulosikigase.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/hpps63sar0boimutid6gd4tsfm/gefizitop.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613400fbb0f2f---wuwodibi.pdfIn PDF document text
    • https://businesslife.com/content/files/20522538498.pdfIn PDF document text
    • https://upaspor.com/resimler/files/talujomajug.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351ed386545---bejutosori.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/89109601040.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/qajkca546n10mgu9ir3d2gks92/rogubivulunasala.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/4847734531.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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 11228 bytes
SHA-256: 62604bf84820098575eaa8b5e53cb60a6243c4b1753122c82f0222a2f459a730
font_02_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 18016 bytes
SHA-256: 3249613dbf63c9ae03199cf9cdd7ac634b2b1a01e78d005fd4cd5020b7f92c42

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