Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8d774b5fd37466…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 20:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a0f44281a97f1e910348ed3179f7b5a SHA-1: 94f218593d1af9287c92a3e64d05668a390869bd SHA-256: 0b8d774b5fd3746628f2d8064fcfae0122bddf75e7b96fff24836813e83b579d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates an attempt to distribute or phish via these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=simcity+mod+apk+unlimited+simcash+latest+version PDF link annotation
    • https://biocenfis.es/uploads/assets/file/wavedur.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/ruwirelukuzajawej.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/51390366302.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161336e340fe50---30007763803.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219211750244872.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/masifudomomukibejet.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/kupad.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/putelokimozatalobariliv.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/78391253778.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/25619400809.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/42629664482.pdfIn PDF document text
    • http://hasyo.net/files/file/53123629493.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd26c267e---91973781191.pdfIn PDF document text
    • https://foulardfotografando.it/file/74425829835.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/40173439300.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/xibajisigoxuroki.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb9bf76830---87407537434.pdfIn PDF document text
    • http://aprt1day.ru/file/wixexizalutof.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/mivaz.pdfIn PDF document text
    • http://orlickachata.cz/files/files/tufawut.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/memuti.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/sozixerepamosefit.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/81790644819.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/85448883414.pdfIn PDF document text
    • 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_off0000d4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 11224 bytes
SHA-256: 9cf355adda6e41f3df4924424d442b2e08ee072220a0fbdf5c76a24fa96b4fc9
font_02_sfnt_off000106f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 16016 bytes
SHA-256: 33d9e7333ee2f72321fb672eff217f4db629801618cec71eb743414645b92ced