Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1596cd7776f3df4…

MALICIOUS

PDF

78.1 KB Created: 2021-09-08 10:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e78eed8566811c1d878df2851f3f17ad SHA-1: bb40f5e0b08ec80f717bab63f3d753ae08537331 SHA-256: b1596cd7776f3df4697aba0bbbe17a50d6cdc505d29e06caa97b65037de38ef2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9da617a7ee875961ba7dc54824251a48/sukav.pdf In PDF document text
    • https://energooptima.hu/upload/File/rukulakeloke.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4272e5d750---82392402661.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2ba3d6f902d4ab413746ce10a04fa2a4/35367731300.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/39268447295.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/gbr5inf1fe0n96um1h3jeif491/84942985674.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/senexolu.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/fivaxilodesekusij.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107240509393460.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/sepifusuginuxikumof.pdfIn PDF document text
    • http://gaudi.tw/upload/files/54138586232.pdfIn PDF document text
    • https://lordoptika.hu/files/files/loritevorofafuwo.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ed235f9e---wofomejiwevugunumelek.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/76262166420.pdfIn PDF document text
    • http://medi-sen.com/files/files/naxedamadav.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ee37e5dcf---rubazojorowezepim.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/nereguvaxuruvibabotekepok.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wipowedenejijebuva.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607957f5317ad---zojatuvupox.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/wesebezininuzulagujefuwev.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/9sgv16e4a00hjslbnkomn95p8r/dalepaxiwu.pdfIn PDF document text
    • http://iccarrentals.com/files/file/tiromazeketonem.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/dunajufodumawan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=diversity+in+the+living+world+class+11+notes+pdfPDF 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_off0000ccc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 16900 bytes
SHA-256: 3fcbff41f0c4d20cc37697501c56a83d34d6a59ed70acaceb44d572246e7a38c
font_02_sfnt_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 11220 bytes
SHA-256: 0742c1216f0f5c1c824e4fd6791e610c7a90e3229abfdeae945919678fb9d5e1

Open this report in the interactive analyzer, or submit your own file for analysis.