Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1448ed36b637049…

MALICIOUS

PDF

84.6 KB Created: 2021-07-21 07:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6d223d4cd1c66c1091d5deaab5114cd6 SHA-1: e7edc2100cef3e4781ec82df44aed3079e99b3e0 SHA-256: f1448ed36b6370497562b822e7825e8544eb8e19987ffa43587a87020c337932
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jambukuning.com/contents//files/96900623737.pdf In PDF document text
    • http://dtpokebar.com/uploads/files/gurulemivefawi.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/lujupabewotulosuzu.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/ganenasepase.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8fe3d793---66036372725.pdfIn PDF document text
    • http://xsteelstock.com/d/files/xudejikagebelivaluja.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/4597174458.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3cfcccb0b32cfa57be1fc3c82058ac18/70036426895.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec45c8326c---jojavavegepagora.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/24322758829.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/lodimiv.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/12b95b91e142eb347f612acab9a121aa/jugulufazamewapukokage.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/falokeparesawadisubegi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e25c9bda0---sasafe.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5beb017277482afcd192a875f2b4dfef/81896286260.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/03vps2nuh9vbcef22agc1pb46q/46992243986.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/41521615375.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa2b87ae6d---22580073021.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/fovajejedew.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/73338508261.pdfIn PDF document text
    • https://hocngoaingu123.com/upload/files/rixisigokex.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/20809752064.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/31366168585.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d524cb8e467e1cc7e628cbaf5344677a/1163689985.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c229775bd---febuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=different+hand+fracturesPDF 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_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 10508 bytes
SHA-256: f0461a30e8119270fcfa8de3cc0bcbc19e2a5f085eac3b4439317cade2ce4247
font_02_sfnt_off0001194f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194F 16792 bytes
SHA-256: b609c6f620b673e57e26684e834bdf4c22b43bf355f686d01d40641e410011fc