Malicious PDF — malware analysis report

Static analysis result for SHA-256 e003b39dd271aad6…

MALICIOUS

PDF

94.6 KB Created: 2021-07-24 10:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a0f96a300a373fb0fa07b9757844dc0 SHA-1: e16f6ae42908f71529b1cfaaa3fe2bd3a5e11406 SHA-256: e003b39dd271aad69e54e057dac827b9b84d1fcdd45d93d26beaf10598f28a64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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 http://libertyquad72.fr/userfiles/file/17437785646.pdf In PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/lomojefotuvam.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d27b4df4d---tilitup.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aba0d03e380---zovogajidub.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/72638045594.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/kutetuvafaredijivotewu.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/99107012920.pdfIn PDF document text
    • http://maihome.hu/admin1/file/dibexubexupaj.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5a3dba084ae0772def203ac2307b52d4/mekerazete.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/5j7bfe356u5fo0lnnhdfof81m6/baforodis.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/c30f828f8d4ae9cf51d071ad5d980c29/zawepalotiparerit.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/58115815543.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/885222882f5e675ef45ed878c13030b0/24240120736.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/debamudebowefurisowi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b70b787775ff7d59f998eba7a809b9d9/nisojosakarakuzesur.pdfIn PDF document text
    • https://actor-conseil.com/files/file/notijuvekepiw.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/zuvemoxewegofasizusap.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/36691151990.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/el6vcnkqo5b0q2sqaehf46diss/55505118621.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/latavidosozulavitok.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa050e3e285---25302418220.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/faxesu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/91bd17c8ac1ed84cf2160b42ec9bf012/mofituvujururakunijifidam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=100+pics+answers+shops+ukPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 16476 bytes
SHA-256: 590f9cd30d6841273dd7f362c4654261b319756a6100b9559507b1cc520b7eeb
font_01_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 10680 bytes
SHA-256: 140b65021cacb9bd4f4db66e9e1299da5420650f239b1c4d97609d3e041b6a15
font_02_sfnt_off0001239a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 18276 bytes
SHA-256: acfff1e9bbe45fe1706d12beac2d9df174384b32ece2b530c6982ff0aa011d49
font_03_sfnt_off000153ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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