Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bbc65390c0f7ff…

MALICIOUS

PDF

95.8 KB Created: 2021-09-06 14:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8d702c48d5a8f0660ea6256a156bc53 SHA-1: 9f4d34f409ff52fcd5f0836be6b34ef63a97d904 SHA-256: 88bbc65390c0f7ffdd91b90afacf97a937cf98bd00a18ba395747a0ed3d70d78
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL targets point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c7e975c72---bomesonujavat.pdf In PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/gederixinagewejodoz.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d6dbefbc4---93258636184.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/afe24573ea54017b8154107952b22dc3/rurevujovaxinadomi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ddc4f776e21e166b033deddd9c1ea7cc/nazurapupiwebulo.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/xasijobaxokefuwiko.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/35a3b1f2ac923110877d0b1b473e5151/kemuzifexuxakete.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/xikiporubomunulodiwunerav.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/zavuparijuxawinonovawa.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/j6l027fg95d1kcu4upsr9s0tfp/38881764148.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/36391181464.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1eb6bcf17---zejopexipuperufebinoveni.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/8155603387.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e94832265---fizaguzopinuzeluxixu.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/jafivu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/llj6rmsbotkrm338ik4d5fu7fn/tuwojofotejakinusamu.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/93816669895.pdfIn PDF document text
    • https://digireg.sk/upload/75621737382.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/6074521938.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071370a40e6a---46552246972.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/sotuxovivusafiragotu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64313f00f8---28359842688.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/lajini.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/99586318429.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/5gadk9u8k9eb5ai0ie6m4mhesb/17528356626.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/papinuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=urgos+clock+movement+repair+manualPDF 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_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 10980 bytes
SHA-256: 8bc9b5b271ff5aac2770d619c2afcf2ef0ae8a16f5cdd56324ae10a7ae46a0aa
font_01_sfnt_off0001256e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256E 19668 bytes
SHA-256: 183e28d98dd5c6609ae2bb921940966ad5777e8686be12e68e174cc7284dfb0b
font_02_sfnt_off000158e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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