Malicious PDF — malware analysis report

Static analysis result for SHA-256 de87749c62b3d3f0…

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 20:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08b1fb0c51c70b7919ac39ef7c621005 SHA-1: c60b69ab3aaa377a079233dba4fc4467b17904aa SHA-256: de87749c62b3d3f002aff4bc5bc85cf8dee4f64a90683ba929d2a5bfc30c9ed9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for information. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b152b752176---fikodofaxozidokema.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2119beca7c06ac9cfcea20da2c6029a5/misumabatosonafeme.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b97edd29c30c190c0f021acee2a5754c/59719670581.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be5ddad2c7---dazonetujep.pdf
    • https://amblamy.ee/upload/file/14197437100.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829e4e768c3---vutadukawupo.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160927bfe29fc1---redotepigi.pdf
    • https://bem-sa.com/img/file/viporuripozi.pdf
    • http://bakoca.hu/files/file/zoforilelisipope.pdf
    • https://mebelihome.ru/upload_picture/mudoxa.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160910cc3c892e---89229070919.pdf
    • https://flyags.com/editorResources/file///8674633293.pdf
    • http://placc.info/up_image/lolakokawozanirutojojen.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/417223a5a2cd64965ca999de946afd5a/47185720337.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/hhhq8us79ofuovjovsa6a70fi6/91501497056.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/93f1dc6dbddaf76c85208059a8f4b13f/gawugaworuv.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39de080f06---misemupik.pdf
    • http://www.look4job.gr/images/_user_na/file/xepop.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092011579b93---82163427680.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/61683a4bae67ee58074a295dafe26db8/momanodumazofujidutaf.pdf
    • http://haumeaonline.com/userfiles/file/tekegilakominijovuxibugo.pdf
    • http://grawerlik.pl/userfiles/file/josawupuxazifofaj.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/4388781cfdd80819f441cc07cf0ea76d/71735648067.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=free+video+star+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efeb.bin
13156acb47ccf9bb28ebf2be9f9093dc26983a295049e8c83495fde3402c9bc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 10344 bytes
font_01_sfnt_off00010767.bin
47aa11ea9f0d94ef506e8c85e0a8fd6c9f5e9edbff34f4a388bf7d3b7ee8baef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 16928 bytes
font_02_sfnt_off0001339b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1339B 16792 bytes