Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d53fd6445b596dc…

MALICIOUS

PDF

97.2 KB Created: 2021-07-22 23:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a56ea80af96ab9dfc02d16c510e4345f SHA-1: 628446cdd31275a64e2c62cf73cee619c476e3c5 SHA-256: 8d53fd6445b596dceb7d41a645e0338400f1041264ae063f0f35cc8cd1c964f9
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to trick users into downloading files. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs, including those on compromised CMS uploads, supports this. No scripts were extracted, so the exact payload mechanism is unclear, but the overall pattern suggests a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://kazuma.ru/ckfinder/userfiles/files/detebatomasavomasu.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3cb73632c5---90227976283.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/joxono.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/44783287556.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/vivakusomamerex.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2713591037.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b368dccf33---50267496396.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef43855218---40023967492.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/11977452609.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/wevilalarinalabasaworab.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/ramurerabuganexigip.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/fujusosudul.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d7cc1c1372880bdbc7701dd80022c48c/xumabojonumubogifepid.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8fn0v0pmq60ov4j548hlsnrlap/zotalugawa.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/ziterep.pdfIn PDF document text
    • http://abpaluso.com/upload/file/62477222414.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160918a7d3476f---viroziniki.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/sivubukukif.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467c6bd063---34037592267.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/xedozapiwijoveludux.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160747fa385b1d---67506697065.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/27b75fe7e9ce0a278e1d79deced31f13/59765744153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+screen+recorder+with+audio+for+windows+10+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_off0001198a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198A 16972 bytes
SHA-256: 714ef2ce89ee2e4d4a929026eb49ca46f66bd168c21a7ddc6448e4c33428848b
font_01_sfnt_off000145b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCD 10940 bytes
SHA-256: df322c1620e5d5ced8c9ce7f3e991b99da91931f0195fa10d5078ba43b7577f0

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