Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d2a23247c4d676…

MALICIOUS

PDF

88.4 KB Created: 2021-08-18 12:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8c1c0d0374b06152b667e36eb309dfd SHA-1: 167aafe913e0098e92aa0b896f6bfaf16acfdd10 SHA-256: e3d2a23247c4d6760e95aef6f5c4d736d96eb5223d601f63e9d2e167badbaf9c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs were found, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://asiancfea.org/userfiles/file/pabejoluta.pdf In PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/85911881120.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/84276555108.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/wamugus.pdfIn PDF document text
    • https://baptistfriends.org/media/46068375811.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/lafutadozuzajomimox.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/434349f5f87e52b2b8b6d1502d9bc37f/10213730915.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/67885966902.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/gojuxatano.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c99766741e5fa986065e604a89eb2156/42722691967.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/turubumipo.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/69785179686.pdfIn PDF document text
    • http://susanjeske.com/clients/82887/File/7205954192.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/iov2p7fhivkb9jks3thmp09s45/70964191349.pdfIn PDF document text
    • http://sun-tes.ru/files/file/sewobovozuloka.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16919541695.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082234503f6b---tamupopunonojivoluw.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/kezitesigexitorojamilixig.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/jojiduredeleje.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b4cd5e4b---rujepopumusegefikizebame.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/18912585571.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607836f339d85---lifupidufezade.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/8270974689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=whatsapp+plus+new+version+bluePDF 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_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 10736 bytes
SHA-256: 87a2b8d27de726f59269788d1b00ec01ff8b5f82c562cee9ab646475b5aadfa5
font_02_sfnt_off0001262a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 17132 bytes
SHA-256: 899f104ee5b85f1b4e514e2572e4370271d7135e4fa59581181a88cfae948587