Malicious PDF — malware analysis report

Static analysis result for SHA-256 5707e3805f4cd6de…

MALICIOUS

PDF

90.6 KB Created: 2021-07-29 19:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f2d6233791fd5bb6f263266d1fa228b SHA-1: f9cb514d2af4aedd02762d0b5466c573546fca42 SHA-256: 5707e3805f4cd6de9b9eaf774a60629ab98e26839321fb83cf8be5dc3c5be32b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://hum-lucknow.org/test/fckeditor/file/gaxesovetitakivevivitufu.pdf In PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f64295c86514e6560a3f96f6aa2659b8/77948633247.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b2da34e7510---sejinabuzejonalogukidupaf.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9715658100---gizalabogaponibogan.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/zunoziwodazotedorulux.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4383c09f51---56356888282.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8be421725---19467178856.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea73a23d4---nexopifurujideziwika.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/rimoligijinixizuvavabaz.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fddca8e99435a914b6ab488ac7522a43/gowal.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ab2ad693140d1dd57404065fdfc7374f/zopabi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a16b44ab7351816fdc053d87f97bb50c/47211563602.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45480a73f---vakofideloxoxofovu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c68c00ac---8540160211.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/53574210480.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/luzep.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210728_063404.pdfIn PDF document text
    • http://huntland.hu/upload/file/73595470086.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/869b77326081e8b5af23a8ffee7516d5/voxafilulibuf.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/7139263106.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/vib0urut330dpo2bphv1bvricl/bazekelejom.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac332ead825---xozakibikono.pdfIn PDF document text
    • http://xsteelstock.com/d/files/xeloxazuduvuz.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610293eae8900---titiros.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/vakabikixuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=biologia+y+geologia+3+eso+oxford+inicia+dual+solucionarioPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 16084 bytes
SHA-256: c27fafdda185be2695e99106f22849c7304d1d4eff2202c3575f3979fbde09eb
font_02_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_03_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 17740 bytes
SHA-256: 9aeb7a9a41c30c59bb510f29c7711cc7e2da0c31e62e63a5094deda80d8903d4
font_04_sfnt_off00013f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F01 11092 bytes
SHA-256: 8de9ec1c9f5a6ffbc28609eaae51857d6bf6607a547037c920cd5d1e6201d600

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