Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b4816823f35c03…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 06:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bbfe2ea671794ca78a879780545721e SHA-1: e1aa268c9c705407bfbc665a7b79af070661b123 SHA-256: c1b4816823f35c037815a9445909f93c75c6f2b245e9525d59f41354b901e96f
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external sites, some hosted on compromised CMS platforms. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://p-energo.ru/content/file/47646665905.pdf In PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/73651411151.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/pefipituxurelete.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4dbbae705abfd4cf5303b78566159e14/6679124749.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0ae6b48c---sonaxefujobiletukuvufo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370e94cd9e6---49617909217.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/24243659785.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/98536734930.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/sskpl95et8h7ih61bt8fsi1sni/97735644710.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/fudawiraleworavugabi.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/71185873205.pdfIn PDF document text
    • http://gibisch.info/files/files/90171764511.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/vofopufed.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613f34eb09796---74486708449.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/56909215649.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109122022529308.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/gogigukipes.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/84507414673.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/4511646378.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/70527006764.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/fijebozaxebiguvezewap.pdfIn PDF document text
    • https://chp-travel.ir/data/file/golare.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/14651236080.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/batix.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/93066027463.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/22132137474.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/e3ea50db8963fa95e373d1fbedc88ef6/12656230062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gta+v+apk+download+realPDF 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_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 17656 bytes
SHA-256: 3064770690f9c1862ca69b7738379688b678e349cb28a5b5e91f78b09be9d6b5
font_01_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 10408 bytes
SHA-256: 2290361198f4443e4e685daea63c60e284692e693d0da940caf90b6981a0814d
font_02_sfnt_off00012c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1