Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be8571eea79080a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 09:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 583c261ef4c652c7e9088d2eab161e0f SHA-1: 67c79c6ba9078096a400994af75d9e33b65c3936 SHA-256: 3be8571eea79080a13153cf2722e33ffbe7ef798c74bff15e105063663c39ddc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm and a brand-impersonation credential phishing lure, specifically impersonating Walmart. The embedded URLs, including one hosted on a compromised WordPress site, likely lead to credential harvesting pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+remove+phone+number+from+android+phone.
  • 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 http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417ac397c3d---26982615989.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kh2c8apbjkp7khracgngmfmle6/sewimikazuvo.pdfIn PDF document text
    • https://langumeistras.lt/i/File/44935449324.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/mititojumakuj.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/k3vd1s7h7nr7plppatjjv33tpq/vegemelaforifopaledaxikit.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210918225502.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/40041282921.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/mulibapexenumamo.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/nedupakujuwuxalotite.pdfIn PDF document text
    • https://istanajp.com/contents/files/pevipajew.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/79286215196.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/98621551544.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/57368410917.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/paxal.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/denebesatuxunizakuvafo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f1dc881a2---lotod.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/vefavonanekaseden.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131889c6b2d7---53324185189.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/4060166857.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/91669029287.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/aa0a6f5ff8deab2f2a5dcfc87be22e97/89589320604.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/kozuforumupegabonuwuxor.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/43764298413.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/kikorejamawokigozipoj.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210909145220.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/xaverewit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+remove+phone+number+from+android+phonePDF 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_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 10932 bytes
SHA-256: f33ed037bd86a962d97cb4d08a016a4223b91323823ffa00699f7235ca78b3fb
font_02_sfnt_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 18512 bytes
SHA-256: b3f0c3cc0e9786fa38fcc6303058041e3ce8358c1fab3169b3fda2bcaa333050

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