Malicious PDF — malware analysis report

Static analysis result for SHA-256 0502af96960bed91…

MALICIOUS

PDF

84.0 KB Created: 2021-07-07 16:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da84e22e14f81da0c9cdeb2295e27b68 SHA-1: 0825c3db620e971286f27cf64086a17492113602 SHA-256: 0502af96960bed9143ef8d3866cefba73a90a00d5d0dcc560df8d9b72dc5d02c
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The document's structure and the nature of the URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=md5+check+tool PDF link annotation
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609444e11d8b3---xowadujidafibut.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c0d2d94f541fa7f82258661b6704a354/fitulobesuvuvikate.pdfIn PDF document text
    • https://people11people.gr/uploads/File/temerixi.pdfIn PDF document text
    • https://beaszemin.com/files/25802475192.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/59512823476.pdfIn PDF document text
    • http://www.asslar.de/downloads/bonerawafuzoxewibedu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/nbm5jho1jesi8s466b00ve3p20/77610713833.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c379b909551---68808885533.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/zenobidisi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/29880866237.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/69949692454.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/lagaguwime.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f7e7be07---livisisidaker.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/36375085131.pdfIn PDF document text
    • https://energooptima.hu/upload/File/nowalagolekegadupibori.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805008a9310---fudesedekotolesokag.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c3b3857a8180ea753001a421a5035b24/88314547741.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8ab4d7cf9318a13d8d879770d443ed32/48491925717.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/86vmgn3svadl34ivlr94at9155/febosemijajelulaz.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d69ab2d1c---damubunovovonimuzatasen.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d05c2a2fc---nubemepukarojobago.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/manij.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7e0507424ccb4455c094ac7463c29ab5/sigexuputexumolapoz.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/86685926960.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_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 16220 bytes
SHA-256: feef73a4b6391c996915b1c1e8021ca7d643305c571897abf88c9fd29bab65af
font_01_sfnt_off0001143a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 10060 bytes
SHA-256: 26ed264fbe0183b7f06f50a50c34c268d3709c46a1b832a4fa9e3a518525d112
font_02_sfnt_off00012ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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