Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c26dd9c3152fd9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-17 07:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1da665ed91c4e7b2c890f372ace85318 SHA-1: 9846a0d50def4df022c1b8dc878a4f0bb969e5fa SHA-256: 73c26dd9c3152fd9fd4c8385062245b674578bd913d3545a3df28e25d16c0edd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of a link farm designed to obscure the true destination. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=beste+bildbearbeitungs+app+android+kostenlos PDF link annotation
    • http://salman-group.com/userfiles/file/kidopebenogowilezaxulob.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/vizalit.pdfIn PDF document text
    • http://screen.by/images/file/nojuwunezi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/a88391e94133041fb74b1a046ce7e7a1/rewolafunozaxew.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/82235474537.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/35070269922.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/65243240001.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/56095457136.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/73320057791.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/mabozivarajakebup.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/86056488944.pdfIn PDF document text
    • https://priscar.com/documents/files/74438742511.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/10183446539.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2305a141---sokofetipoxabife.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/45779433851.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/tokif.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd002e7406---naseneferimutolagorev.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/31016166825.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/mugojigiwolazo.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/fojopugejor.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/35784814574.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/bejodenosozedavirukutanaf.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/egf60k3cjgetshjato1k1qhiv6/lezotisekoxifitovepep.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/gujuvatesujixusufewiziwo.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/tugemasonukusu.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_off0000bdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBE 18340 bytes
SHA-256: d02b792c64ae80b1f6036e454e7e48dc667d8b4e2a181ed668263c1e7b3fb343
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 10952 bytes
SHA-256: 017b08fdde0aefa923801cf515fc8318b1e96292341297135b22d7fcee49dce6
font_02_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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