Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1a9f5170eb50ab…

MALICIOUS

PDF

90.2 KB Created: 2021-08-08 07:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 538d336e4ac52d747ae589d8a1b44b3a SHA-1: 5283df4355e1920014fa48c882aebd86223b0f8a SHA-256: 4b1a9f5170eb50abf3191495bbf3378f5133a8077aac7013899ec9cb58b8ff37
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malware. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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 https://travelsafeway.com/userfiles/file/devavanemebapidijenafasom.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/cba72a92944b74f1123a3ade3f034fc2/87189970446.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a717d5d85---3694684936.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/zinepatemobadazipewo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f3886e83---wosutaragixuzivegepefub.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a74ff3cafb5---relidegumag.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/lmojoiq9fafkr94qmdr92pvmiq/50915912904.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/2srfcau10qmd9aq00eq4cugn59/96649925717.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/65403626314.pdfIn PDF document text
    • http://starsunited.at/upload/files/37504790460.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/jadojuvef.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608d608320250---52181875102.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/togofazupejatemik.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d1762276139f9c729a77d9d504c64a8b/sadojasebubijizokonak.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/jegas.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/88022818272.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/buvak.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/74771052895.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160736abaa75be---vanegisameveminutiganixaf.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/gusunexusib.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/motugobojukelipefijab.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xapekogimizon.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/berabemerovuriku.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf97d38683---xilogerefaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ecology+the+economy+of+nature+7th+edition+ebookPDF 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_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 18676 bytes
SHA-256: 933ab1c9b33f0a964f3090fd9c3bc36544aa74a9d9e9cdf23d87db2c2271c6fd
font_01_sfnt_off000126dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF3 11236 bytes
SHA-256: a72f7a24af2c797fee16a8dae7b6288a401d519f519b720805b7271063738412