Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b18e366a22aea6…

MALICIOUS

PDF

104.9 KB Created: 2021-09-04 15:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 752a80f94ea2dce74ff91ab6e4f8da5a SHA-1: 51d93e44d0687428e2945a01eaf299fdf63ba093 SHA-256: 89b18e366a22aea65e05e0fc4f98e703815ac7c4ce9076e5863581c871dc831a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous URLs, many of which are part of link farms hosted on compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The presence of external URIs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://huntic.ru/uplcv?utm_term=family+and+friends+book+pdf+free PDF link annotation
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/35615203839.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210622224824_8wetx5.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/godak.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/78b05eb07084ab2faf97a60dd4337bfe/28270242251.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-26/20210626204800142597.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/76420146212.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/41147106878.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608123a7a4d87---zutifinudoxupu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609170967d64c---13987045762.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/36944547909.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05b524431---xeloxabujeloxibenejeve.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789b9b2faaf---joxokazubarem.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/tiwit.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/5ea62853ee2da6f2810a89f2b5d0f0df/nesuwigafofuto.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f094a3c02e---nozudapu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160821b1eae895---gujakorunefagugadevudilu.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/40319763577.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/27523207175.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/fifokutunetojasija.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/dafexiwonodefar.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d69db2ea9f4d12548faf29041153bfc7/wigibawiru.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607407ecd0a7b---26910001947.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092837520776---53969670634.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/voteka.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/64528496340.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a50d5d89bb8453e6513de30d33cc9ee2/juzujiwodiwo.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_off00013235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4C 10884 bytes
SHA-256: c70c288b43f680401fd02089a1d8d049ba836684c9d7bdc871d4e74a8079bd14
font_02_sfnt_off00016327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16327 19216 bytes
SHA-256: 651a132f44c6b74a5a868e30819a9988634824675f9fea67241bf839d3dbb517

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