Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aff8fe8b8796d9a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 10:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d4ed552f4a16c81608c32691e5cb4ec SHA-1: 9872dccddc119a7e3fa46fe871829d82527a9f1c SHA-256: 0aff8fe8b8796d9a16de8e37f84ea3e57ea890c527468b44dd70cff3270816c5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the ultimate destination. The primary heuristic, PDF_RANDOM_URL_LINK, points to a suspicious PDF file, suggesting a multi-stage attack where this document serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd9718a29---99187440002.pdf In PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/7f8cc243b4db2d6212a5de59e90f7d14/98690601440.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f459018af2---20138285303.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/guvogenogiwonegi.pdfIn PDF document text
    • http://belniig.by/public/file/25467385887.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/sewejevaruvave.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/67bb95720b31a015571dd25d70fb3b07/nopezejumebexix.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/43599156135.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/muzajomapijidikamefuwuni.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/50461491454.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/radunawagimogevova.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f26f0e36---35032642743.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd98f63370---25374581408.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/37712088498.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3586c35ac7---86558502500.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/tbnouo1gof6n1i9odg1puhbocg/51203718240.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160769a6dda55b---74446292994.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kavadevuninakebisibupese.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/jr1lbfmuna3gtapdu4p7vvrto3/85811369784.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/tuveromizeriliruraxilupu.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/mivej.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210726120324593.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/82408387420.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a84fe49faf3---66731451093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=frigidaire+affinity+washer+and+dryer+manualPDF 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_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 10956 bytes
SHA-256: 93c562c6f4104c64c83a30774be8d852addf4f1016b804ba42d408102771940e
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 17508 bytes
SHA-256: 217d4f6bb117f0b00539808506f5487610bdc18386af4b51b0ab93cae042eecb
font_02_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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