Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0352e3f3ed1c274…

MALICIOUS

PDF

96.8 KB Created: 2021-07-30 09:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eadd85f176c310e21ed8ed3988628251 SHA-1: a27b935c81b28ef4b30e42da5f8247f604d34d95 SHA-256: b0352e3f3ed1c2744f45bf4bf0aa63c891a3dd9d7d21f0c1babd164b4aa95c8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms on disposable hosting. The presence of embedded JavaScript suggests it may be used to exploit vulnerabilities or redirect the user to malicious sites. The sample's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2172bebf55eac879919ffd7c6c5cf32f/68293007743.pdf In PDF document text
    • http://weberstellen.ch/userfiles/file/1719800000.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877f5f2817b---18646306800.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/33307399274.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1d1c1d6bd---vigofizeb.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a443ab502b---nufaxiluwakiketifedaros.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/72252090861.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/kivutofopaxibovekom.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/56c2526ce44c7b7de6ceb5367cdbf2f0/moxitiwo.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/welutovivenifumuduzasaku.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/87455331356.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/65479716857.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/77709014594.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1778a6749e---xulevekedamekegudokat.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160772f65b726b---lidobaripigurajakasevol.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/bogokumoruzebezo.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/mugakalaziromonise.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/voranafibetimifutovu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e85548ed3256188f2a68dd60f590cb6b/24499781282.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/vasugifaminulosizubu.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098b49713a9a---30674829093.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/94784180634.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba4ecdb654---durenevu.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210707203100.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d827d6b41---41165409569.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6cdb43d0---zanokukapiranubadowabati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+use+ecers+score+sheetPDF 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_off0001168b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 10100 bytes
SHA-256: 730d255470b04364d3e6df3873de0e3f842589f3d059a1c1d8f32342c1987d9e
font_01_sfnt_off00012d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D44 18364 bytes
SHA-256: c166c25f04aa477198ee22be9be8d828554923486e0328c6c775d5de41c7c70c
font_02_sfnt_off00015d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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