Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b8fd1b22c029a4…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 00:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 972e45160598c387084f8a2f49cf86d7 SHA-1: 7a059da69a2654f298efb9b9bb00391b145b2fd9 SHA-256: 87b8fd1b22c029a46c6242a9368be334604fb74de3e6b76de09c441a89ef2366
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farms strongly suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c128cce9378---lepamomabetigamonolirov.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a46708a3---8616155970.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/pazumikozumogikogaru.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/fuzanozojodol.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/vujofepinugovelaje.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/6192743351.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210623121607_dzsfvs.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801277f26b8---wifovaxopimezobobeku.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/jusibizuno.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/8884302999.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/rirukijiz.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/765dd4d0ad741ff775fbeb18ee972a1b/57864069345.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/bupezimogatofitewuk.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/xezoditodebisovewip.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/84869262975.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/gufumav.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f476cb5947---31752978851.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/mubukijipajevokop.pdfIn PDF document text
    • http://aweibel.com/Photo/file/94754001295.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/39437081402.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6a06bbb5412be7d8a2b71cac678e07a5/96990831267.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/664d0cf17184148391b50cf153d2b76a/7781551060.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc4rp69iahvgqahhdpbsls8tp0/nararen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=free+english+language+learning+books-pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 11024 bytes
SHA-256: 26a5b6c51450f87bdddc47a776f09f51b4f1d9e233b59cfca3d9c9d59bef810d
font_01_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 18496 bytes
SHA-256: d2e8da2c7f640ccd9fe81c951835763fe9c2bad883f60d857a666b07fc7d6360
font_02_sfnt_off0001382d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1