Malicious PDF — malware analysis report

Static analysis result for SHA-256 a297a95327253519…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 13:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6a1120d19331dab5a7812b1bfe7868b SHA-1: 81a61d0062c3e98d9e87666c8d9a36e96f46beec SHA-256: a297a953272535195b92641e06b119dd35102877f037a39cbf0013a9690ffc21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://laborke.ru/uplcv?utm_term=club+cooee+android PDF link annotation
    • http://tinavaron.com/ckfinder/userfiles/files/95549913757.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/86802695246.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/96620342384.pdfIn PDF document text
    • http://cloverdiamond.com/file/95205246773.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/15679812446.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/zenakinaveven.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a34992414c---68531096970.pdfIn PDF document text
    • http://simonide.org/userfiles/file/96293279978.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/73908541830.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/74695100716.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/69882790133.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/rexavomamesodesobaxol.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/jabivirirosotilepezof.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/ponukilegakokojiziraxetot.pdfIn PDF document text
    • https://jss-moms.si/upload/File/wuriniriboxikopew.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/patasimibu.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/36839319660.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/38681872903.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7ad975090ca4f0cc4bb69fe5879480ec/wivesusokuguwafow.pdfIn PDF document text
    • https://hse.tw/upload/file/meferuwir.pdfIn PDF document text
    • http://olympusflights.com/files/files/90283818747.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/nipivaseg.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4eaff06b7---94534291157.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/63993135425.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/koxisen.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_off0000b317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB317 15136 bytes
SHA-256: 309bbdccc2ed970f2f1fd8594f6a727aa8e0936257cc36f9ea3e18619bbc1927
font_01_sfnt_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 10368 bytes
SHA-256: a8c75c3cd37b3ab9d46de0ad95cb08c22734eb72efe193e9b8717550e27424c3
font_02_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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