Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef5119aebd5bf0d…

MALICIOUS

PDF

96.3 KB Created: 2021-06-27 06:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 19f41dd2d4913a13c02e1ddba70aa805 SHA-1: 39260a2f4379ab40cc09ba31431e00fe190607f2 SHA-256: 7ef5119aebd5bf0d22cb913621e01b610e14078d02aa5c9f8d07723c82142f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://queure.ru/uplcv?utm_term=white+chinese+dwarf+hamster PDF link annotation
    • https://twr1115.net/files/fckeditor/file/xanaj.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e9cac6cf---davinedamuzelawokiz.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c595c3ed9d8---xiregajudavusuzenamikev.pdfIn PDF document text
    • https://fasaac.org/temp//files/25932472772.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/77052480715.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/277c0354f2eb6d73dedd3286e0800e4b/78202915900.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/pixixenixulurejuloru.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/24914135589.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d074e6966ae---xisegupuguralikefapeja.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/97599318258.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210531123732820831348.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ecb2c29ee---24764618342.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/24a0c16f8e168a7023082b750382e11f/jejusokipojinem.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8fcudsss560kccatpvook0kkqn/70641241679.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210613_A6A066D0C6A1B4E0.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/lebowegedebaz.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/63242202571.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8bc9de93e---51617900733.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/094348326d0d0a9f159477ba89e09d02/welexefajunusozavajat.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e10192f830---38517266953.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe403343a05559bce8177e33bb1c6b7d/jirurelerevinas.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6a15c383c---54711613609.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/zuzudorilexerigazolijew.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/wofowu.pdfIn PDF document text
    • 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_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 18008 bytes
SHA-256: c0ddddf6e657c3cc0d890c4939df6e7e8094fca46d039650ad7454fc1ca2098c
font_01_sfnt_off00014397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAE 10656 bytes
SHA-256: 91609ead783d14ee4f6f121085f921b69e9d6fe19b659350f8705add754cc5bc

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