Malicious PDF — malware analysis report

Static analysis result for SHA-256 d197af5d7791dd0e…

MALICIOUS

PDF

111.3 KB Created: 2021-08-06 22:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04c7a9dcfda72c22b72d34611c009ced SHA-1: d476615fd1e4c6a8191c5be429b1ac63ed2aaf1a SHA-256: d197af5d7791dd0e902f4010b16a17086b3b5b27b19a370f7125fa77a4b7b908
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to obscure the true destination or host malicious files. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/f6c775dca7b8a01009910303f70006eb/xejep.pdf In PDF document text
    • http://cuatudongsaigon.vn/uploads/files/6833049722.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/masojewiv.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/39361753885.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/l17iul2k9u55mlsatkui65ieg0/jekeputu.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210527220501_t84lg3.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a4345765---bajowuzakixadafexudalel.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/dk80p0ia6d41ikmgjote5jcoup/topusiz.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ed814b54---vitizagunugob.pdfIn PDF document text
    • https://digireg.se/upload/dixebizofavijexidamow.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/dujadoselofes.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/nikupi.pdfIn PDF document text
    • https://sanagustin.cl/files/95100093970.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ca9699f5---viweperemotadozigoj.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/77837409569.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c1ba5a0a74d58c8d032053d216fddeaa/dovojadeje.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6304a6eeb---xonajonegiwak.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c17abdfd545dc5172a9e06951e57e3c8/68983716882.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609839ff2cc2c---65477985031.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/kowokika.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/29430766997.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/pigelanepumajejameve.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f9a0a268---kagibugidupizupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=barbie+charm+school+in+hindiPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011eba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11EBA 20180 bytes
SHA-256: aaae59f0c690648f9027640f6dee1215033108764bee142e80ff0fe021cfaced
font_00_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 10732 bytes
SHA-256: 6377f025c3245dbfb5fbf9eb7b766a3571085fb6a72a5a29af64d3f887bf46c0
font_02_sfnt_off00014163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15970 4292 bytes
SHA-256: 5c9b21138b03c5e2f590d2ba7f80b3ffd5e677548bcc97af5d69588f086a4450
font_04_sfnt_off00016a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A02 25820 bytes
SHA-256: 668c668797b5c171764ab12dcc1e25b96996cc86b8cb1ce0ad57466a5ba69b1a

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