Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1cffbe2b20e482…

MALICIOUS

PDF

80.1 KB Created: 2021-08-04 11:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3358956b4f9cbe6969949f8553d8e911 SHA-1: 9ba9e1459bb859dbc5c81468e4b4d5b8bfe1a609 SHA-256: 2e1cffbe2b20e4825b6abbe23d5e91d62e31333d16a5bee90af9345b5d9c6d78
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f026e1de5c95e2672731ba22fde0a296/vikakofo.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a45ef179db0---zezokikesug.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093669f5c9e9---medidiwumogasupewadakuj.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210704083433084.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/pobetuwazutumowigimava.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/18491591422.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609deca99da95---gatopuwutivomebebolej.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe2715665b---xejadirunuforo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe17cd923b---46311411839.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/86780054305.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/6038605078.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160941df6789f3---jipedulikupuxerawes.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/wizijitopikunulaxa.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b2d904e6a788308a26510ebb63e5ade7/ronomomigilimaluxive.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4910ceefbe3591de73629f3e12719081/gepetuwixado.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/36083354272.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8f7e40769---losoxuwarorigisoruxi.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/71497492668.pdfIn PDF document text
    • https://nada70.org/userfiles/file/17955062356.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/80b7da01142db1dc9514cc5f546e27b6/maxuvevifurisitinirexe.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5935a405---waropidum.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/84079653484.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/dasuwadigepivezisusafexo.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/96889383247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=exercice+corrig%C3%A9+budget+de+tresorerie+marocPDF 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_off0000d3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 11044 bytes
SHA-256: f10805968b95a146d1dbd1155e0ccd636ae65115cf3733c351d499f3eed35af5
font_01_sfnt_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 16844 bytes
SHA-256: ff7d06517a9133d56bb246894a0231ce6e1734fdcda142abd069b506a04c2ee1
font_02_sfnt_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1