Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa02a296ef0798e7…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 00:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cfa89d864de0d464b9cd4c7164f3c956 SHA-1: 2f8177aba4c4704184a6bbbd809ddfff10294962 SHA-256: aa02a296ef0798e759ead979e0c39293dda83dd42950500fc82017c55b248c2e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to drive traffic to potentially malicious or phishing-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108ace768c9e---58626974335.pdf In PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/bawivuja.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/38196764712.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c435j7fj00q13g1k10bo72io1i/javotig.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a6395a6b6b9a89394238596d85cd03c2/33309443260.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/vk2p7lo86s6iqqq08lqf4mcbq5/segejamibemamotebimemekiv.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f09c37cea2---lokurezavo.pdfIn PDF document text
    • http://arslanemlak.come/file/74156229150.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/78207684745.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/tevojononoledoni.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9ae19dcda9918e09a195775e5c58d63b/vudizof.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/14b48c6d9a8861b9251e5759d2db91a6/vigolaxejiwivaso.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc27c51e6fd---xikomogujudetu.pdfIn PDF document text
    • https://ms01bet.com/contents//files/16648905583.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e5264db38---95380429239.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160761d34906f4---detome.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/s9u2nhqsckme69qgq8c34irt2g/82318436090.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/sopufuwagetudema.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/zurimigezejidalabulu.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/polexemotoxiwet.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/fexofijikeleziwimow.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/94784489913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=renters+rights+california+2018+pdfPDF 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_off0000c9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 17772 bytes
SHA-256: acd03a3a41c1be9cc5152cd453b0138c21c211134fdb3daa67868c47250a5354
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 11448 bytes
SHA-256: f784d598e29382328dd2bb94721bc3cde74ef4b53714bbfc80aaaff0145d04dd

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