Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d0c46e982d5768…

MALICIOUS

PDF

73.8 KB Created: 2021-10-01 14:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 847f71e94311906646eeb8d9730e1998 SHA-1: 8232ab7fb3e4b657546a4203871756aaf7fcc540 SHA-256: 50d0c46e982d5768644327ceacaf57326b26b54b4b8d5284415ef1fda8280152
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://www.advokat.com/app/webroot/img/fck/file/kepajov.pdf In PDF document text
    • http://restokrat.info/userfiles/file/83226062993.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/zowixiletedid.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/95862752979.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/bosofexigufozefugosa.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/xivimelofap.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140cc7378ad3---39012575473.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d5459d450b8d8409543707de3cefadaa/pabovagekajulerofulo.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c483dac713---97714773525.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/5928132423.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/78748167759.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/28658081214.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/viwujidizaxevodeta.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/63177549070.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/6952026942.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/rawazewekozexonujirefewep.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/govupik.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/supogusofuvorat.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/4734067281.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161348fff82f78---lisakuvuko.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/tinewedafoxaximes.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/dozuvesuxizive.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/23838537540.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/zoramuginuzeresokibizoj.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/7983969888.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/sekonofuga.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/lixenajibinodezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gun+bros+androidPDF 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_off0000b9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B9 19392 bytes
SHA-256: f21cfc1bed3138594c8a67f8b7aebeda3d609ae6a8b827336fbab48e37f4409c
font_02_sfnt_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 10244 bytes
SHA-256: 84f52f45e29743cb6c39dc4dbefcd4658796e5cbdfec43fb1c7dcaf7992e165d