Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1494f55e6cbf1ed…

MALICIOUS

PDF

86.2 KB Created: 2021-07-03 12:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4599695a32090246df1d7da91531091a SHA-1: 4e364dc6b75a64ecce420171c595fe612f4bf698 SHA-256: b1494f55e6cbf1eda4d8a4c96f5bd3c4e4411be3682bebd6c7fa7bd0671eb611
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/on2r7aof00okteag4330g28lho/narevorekekobekakenopu.pdf In PDF document text
    • http://short-story.ru/upload/file/dumikewawoted.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/81906965624.pdfIn PDF document text
    • http://www.hmcpacking.com/uploads/files/zuvudifetotu.pdfIn PDF document text
    • https://airbays.com/userfiles/file/83451596340.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fab48a4c27---zafemuvexofewajujatomub.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/vj2fj86lv3pap80langhdoopnk/sizaxaj.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/47780283640.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/35581173891.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/namidiraxupilu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/b42mt1ogeq1tf9pm2q4d5h5at3/sotipivelifizi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca9aeb480---14411431529.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf34b67d7d8---zudexazavubinojuvaseko.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/10701212533.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1220a731d---daxumapimop.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/96177056524.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608997b34cc4f---torofizofenigifitagunekoz.pdfIn PDF document text
    • https://airshow-bg.com/file/91740783578.pdfIn PDF document text
    • http://benetalent.com/upload/files/dunavogujivoke.pdfIn PDF document text
    • http://tms-operation.com/upload/files/miwekogutotiwirezulewate.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/67473576616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=98mm+to+cmPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 20364 bytes
SHA-256: 571326ea698d5b085ae275187cdaace6b46743c15ba170d3c89db1f6b390278f
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 9868 bytes
SHA-256: df526be671197be8ef16eef611e2a5ff21c406bbec730ad153a50e8b9a0e3fc6
font_03_sfnt_off00013527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 6092 bytes
SHA-256: ffa31a752a191ef1ad4c9c807becafd51a34c49277e5bdb868add3883a79fe39

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