Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcc2eee466b7e5c…

MALICIOUS

PDF

95.2 KB Created: 2021-09-07 07:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eaf456645b22b6faa3bbe0ae5291423b SHA-1: a2e8482b74bb3fc1adb76d076f6a62ff30d6004c SHA-256: 7bcc2eee466b7e5c4d07452f7ef2bdbcb274be46424f1dac2e912a24f0b3ab62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/2935jdbt10npci9h462q3k75h2/237694751.pdf In PDF document text
    • http://retroldn.com/userfiles/file/81512561126.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607277c106187---fuwamojurajowelep.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501193640873527901.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cde2279d3---timewopajuxexase.pdfIn PDF document text
    • http://mlight.cz/archiv/file/62965507007.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/66e8f4a998a4d6d94f5d95658f9e1c97/4653941819.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/31610892406.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92652565989.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d399305193fe608a4d556bd676e4d99d/10080952006.pdfIn PDF document text
    • https://ka-base.no/images_content/file/tafumoxuna.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/693983802c8abde0bcbe16e7e7a17885/werapumogi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838b00dfd67---16420554861.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/rezukotaxofuli.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/lalofetijidudupupubutokiz.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/roxumilesakud.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/62062185798.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/jamozepoxuwu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f04e5c708e6d0dd6bd5cdd723e0f5b10/35892860005.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1611a234060e89---59151420326.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/37701674852.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/0ac50cb410bc7d49a6c835ee3fd192e5/45549210096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=market+leader+advanced+pdf+download+freePDF 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_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 21044 bytes
SHA-256: 07771e49bb5d77fd4ec386289f4cf6a5d252adb311430f274173c4102dc93e59
font_02_sfnt_off000156a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A5 10588 bytes
SHA-256: 2199f6a4c33054ee319f2fde21ebf8f3922baf9122d3500e9b94ff12b135411a

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