Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38e5d6fe85793b2…

MALICIOUS

PDF

124.0 KB Created: 2021-07-03 11:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 025ebe18c6002a8eab98265070d491df SHA-1: 9f806c721a4fd0c118a42ef4c6f59bd8cf1ea892 SHA-256: f38e5d6fe85793b269cc6e6e964ce2e588f9a2f5c036dd9138f0cbbdaeec749a
156 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 file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting domains. These links likely serve as a distribution mechanism for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

Heuristics 6

  • 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.
  • 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://alkanboya.com/files/file///duvegabinetu.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2bfe3e69a669e60e9fce36e2fe1dc508/kejopokuz.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/fiwilow.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a3eb3be1b---67375455823.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e7f49140---zijijetusarenipibixeziv.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/87562431393.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/60831435400.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210530185217.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/9qs9fmatqeeqllr36a82bpqsk9/51285254461.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092d027bba16---dikisajowetenin.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/bjl5buiu7s7q4a7cu6ge5i6kr7/77307540943.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcae4dfcb---38297522502.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/90744013741.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097581861ea5---vovunurulumimexelonukev.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160d365b1f08d6---sefipusuvi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c87a7e34---kovulet.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608abb313375a---29876264515.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/gigegoduvam.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609474672eba5---15936105280.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021060917351122.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/7125349450b149b528e9429be605a680/63959350593.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b6eeb23263a7e5ae4e93b0133b071c74/90980461614.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56ce47126---7290237380.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160949087e482a---bopefax.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/rixujipogigo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b4ba6utebitspb37pppt7s9dj2/tavudevabusene.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ef9337440651c40f54950675a43b7e64/dujizone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=neurofeedback+a+newer+type+of+biofeedback+involves+trying+to+changePDF 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_off00018032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18032 17776 bytes
SHA-256: ee81bcc54b9c48d1a70eba3f6d385e668736f8b5ec4d37473a39903a04cb06cb
font_01_sfnt_off0001aefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C714 11476 bytes
SHA-256: 5315e5db5c81edf9c0ed9e97ec124029f3ac0c6249867a7f7cb5cecde814f9cf

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