Malicious PDF — malware analysis report

Static analysis result for SHA-256 418b8bd02b0c1d5c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 17:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 19a6ed98c0db1480b014b0907458c3d4 SHA-1: dcc7f54855959c1825749b3511c085a57cf3ecb4 SHA-256: 418b8bd02b0c1d5cedb54016048430209b53a478a8f406eb245042c6437f7b0b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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 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 http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d40295cca9350db732a8479e0e54c9e1/rivazidonesokugetuziko.pdf In PDF document text
    • http://tubietelbar.hu/uploadfile/wopuwukikiwuralonaz.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/rezisivu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4509ff8f---28588898180.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607db19a2961d---figozobefizugewafedosewe.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/melajawa.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/81427624622.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/55366422666.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/eff8ccab29114a25efba5580e9eaa1fe/topizididip.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080d89c3a39a---24890918053.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/16266305324.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/51186679407.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/a4cv7u80erbencd10gh966b996/folaxugemewinekolox.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/xopabariwalaxifozaginajo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/3157910609.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607323ccb2f5b---pakepimuzukotuwux.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/5401659298.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lobuxipowamogesamuvaxavu.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/dubijipupigenaxogegipu.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/37888517553.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/wawenoworerekazerujinak.pdfIn PDF document text
    • https://loctra.net/userfiles/file/91742588325.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/2369821201.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/pedepanigirojoxexedeguj.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/zolatax.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/14619035354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+printable+punctuation+worksheets+for+grade+2PDF 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_off0000cda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 11412 bytes
SHA-256: 05b23528b33b531c79a41c4ab05804023d9e3bd7ca2881ed454304c988aa41d0
font_01_sfnt_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 17504 bytes
SHA-256: 0633a42d09674e10f7ed55856431bbb27f239e03a6136e2ae53ef6b0ea3f49d0
font_02_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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