Malicious PDF — malware analysis report

Static analysis result for SHA-256 018739886a5a479b…

MALICIOUS

PDF

86.6 KB Created: 2021-08-05 13:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f94aa09e1840423cf4f01a1f74702c31 SHA-1: c27352b7b6082f01ad4e7a69ec702f442f92cf4d SHA-256: 018739886a5a479bc4651c9da2419c8168b20dc966a048628e5ee13aa0aaf778
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=cu%C3%A1ntos+metros+cuadrados+mide+una+hect%C3%A1rea+de+terreno PDF link annotation
    • http://bagiez.com/userfiles/file/xolukodeso.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/kodize.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/70367710228.pdfIn PDF document text
    • https://magerp.org/upload/files/59318153738.pdfIn PDF document text
    • http://ahchala.com/img/file/53937595820.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/gqldt5h1prdpdnojh30pfo2h38/femupolexi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cf81aa3e7---9549202099.pdfIn PDF document text
    • https://bloc-immo.com/images/14899352781.pdfIn PDF document text
    • https://begili.com/uploads/image/files/29642137184.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ac43799c66201867aef050cc84bb4544/ragomimadanesam.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c9677ec91---gaketarekamixepikur.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ed5bd923ee73e1041e2832e0be91fb01/84171232702.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/67f337d9fcf5157b3a0033003fb6bb38/40063285738.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074acebc9fa1---pobutujanapukepetetaforaj.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/41883287520.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/luzigefefakeruworir.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/58174128877.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089e2695aa5b---rukonatixoveka.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f45ae73c6---30997406859.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a441258e24e---36321728993.pdfIn PDF document text
    • http://landpas.pl/upload/file/18776149677.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vqme60shcgt4mfu341njcqgj4q/xumupukuvexiwarunerawiz.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fffe26cb1bf---bineto.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f491e925d3---kesisatefuvuzodokikip.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/77742710059.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_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 10900 bytes
SHA-256: 45e001b43971267623a282db934dac439e4664998584cf9082c1b5157ead963c
font_02_sfnt_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 17664 bytes
SHA-256: 68fad60dd60180f30a71cf3626596c908bb52e670eb41f405f746d6de75c3fb0

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