Malicious PDF — malware analysis report

Static analysis result for SHA-256 618e5d23a326c3e7…

MALICIOUS

PDF

90.5 KB Created: 2021-09-21 01:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff647b2f0108bfd158f21992387ec9cf SHA-1: cc7238b0a16ba9a52c84d9f2444362aa49ddb9b8 SHA-256: 618e5d23a326c3e767f7b93d07a10d734531153b52dc77ba6bc4fc806f8eb17d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c5b7f698---48215918343.pdf
    • http://profil-metall.de/content/uploads/file/dotosodafatetedabelakot.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb4b2dff5---dapeselavitizode.pdf
    • https://vwb.mrv-educationservices.com/content_file/files/73229793768.pdf
    • https://audreyheselmans.com/_files/file/92880700679.pdf
    • https://salvatoredivilio.it/userfiles/file/71342463191.pdf
    • https://barcelona-health.com/files/galeria/files/12758906961.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/92112205852.pdf
    • https://bitree.ru/ckfinder/userfiles/files/gefuratiz.pdf
    • http://dieta-plus.pl/userfiles/file/17422769939.pdf
    • http://semanbio.com/upload/files/xakafutejiv.pdf
    • https://vsetinrally.cz/userfiles/file/79633386685.pdf
    • https://pomacanthe-art.fr/imagebeforeafter/files/fazudigojoviwarabo.pdf
    • https://accidentmatters.com/ckfinder/userfiles/files/28063838570.pdf
    • http://okun.su/upload/file/xifujexabokurokefajebuzu.pdf
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/11317937381.pdf
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/pesimaxavedajonimi.pdf
    • https://privatecambodiatour.com/userfiles/file/safoxubupogogoke.pdf
    • http://ed-union05.ru/files/file/bivod.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614521422c3bd---81927305435.pdf
    • http://kuppersbusch.hu/userfiles/files/52261838537.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/figerekesagitiwuwix.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/bc6b31b2759a22d41077071075ac4fc2/maxowupasavu.pdf
    • https://fwstc.in/userfiles/file/jixazetonudivolojaza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+copy+files+to+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd1c.bin
801c972fee965ea65c942b32f9d3dd1ee3254f19e51b434f7ea8929496dcc255
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 18332 bytes
font_01_sfnt_off00012c09.bin
b81b4d70f301bd78685ab4c07e67917de79e14e72e3f812556a972f8329a6ca8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C09 10548 bytes
font_02_sfnt_off0001443c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1443C 16792 bytes