Malicious PDF — malware analysis report

Static analysis result for SHA-256 d513b3cdbabeba9c…

MALICIOUS

PDF

86.9 KB Created: 2021-07-24 17:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eebe4630873755bcab7fa186ca94798b SHA-1: 0627d55215fc293096588661ffe49880225d1b4a SHA-256: d513b3cdbabeba9c04e72c2e7e8eb8f3126066864b48e419187ac166299f83a6
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, likely to facilitate the download of further malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive download lures, aligning with phishing and client execution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ludbaegitim.com/calisma2/files/uploads/81065289024.pdf In PDF document text
    • http://lezeckastenakosice.sk/upload/files/lodosozekososipawiwosulop.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/24528999989.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4725e7dd85---lalazepivuvezojixuwuv.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/82510125718.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/rofaxalilakuguneforukoxaf.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/women.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/62270480985.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/pegagamona.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/25871780812.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b518845ffaa---wusupanizob.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/sotorasivuze.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa5f9512b6---80002935116.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/8g2ua0cn6j2a8jttk64bvpjj02/50043036613.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0367dd705---sitivab.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/kaxumawojumojabijaw.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/filegutamuwu.pdfIn PDF document text
    • http://livestocktool.com/d/files/41370732246.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc1b35140---wewovitureduzomoniligubaf.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbe403a4ca---75712988430.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd5091b0b---5323286411.pdfIn PDF document text
    • http://kco.su/userfiles/file/67173601440.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0da658dfb793a646d9d784ac06e46443/vebokaxugabawibetajejur.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/cdbk68grbi1572tp6tddsb7fdt/xojidi.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/39734080962.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/ead2c8fa7c8e972cf9221cde4e5633ed/78599008744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=all+mods+in+crazy+craft+2.0PDF 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_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 10968 bytes
SHA-256: f0668d887fd7b6f707e65ab1a3e1faea86be0fd5dcf74285390c87dce2cfd963
font_01_sfnt_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 17208 bytes
SHA-256: 200ede6b642219e55a45e4d2a0376163bf4355d392cdb53c920f0812e8f9d19c

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