Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb92afcd619b7dc…

MALICIOUS

PDF

98.0 KB Created: 2021-09-06 09:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d291a154be114dd12dbe65ab051ceb1d SHA-1: cbbd8ec00746e856055e628ea92ccea4d100d950 SHA-256: fdb92afcd619b7dc323af123e5d7b6dfefe9ec8896a30bd30b1f3ecb568d18f9
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to serve as a downloader for further malicious payloads. The presence of multiple compromised upload links suggests an attempt to distribute malware through these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://margheritango.it/userfiles/file/gonudulezapiwosanov.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5d95ef76---70609272642.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/remolotu.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/38530800831.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/wapazowirabugepipabito.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d4632326---97234848117.pdfPDF link annotation
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/qbqg84r7rvv4ikcltfjcq2s057/3151668136.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210816234446.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0c4b0c572---41997858300.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110268ddcd68---2734311836.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe8e0c646d---dizijokadibirorafusabenin.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16103beb8e6a3b---79738395371.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612af9aea87d6---7683649756.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee783fec6cd---38089391620.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/ronifobinawawadepojab.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b1b0fbe72de6509b8c08d466dcaa1b85/lovevixonixofekapani.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/r3ean67vmqva1uuqavuqdk0bp1/folakupakakafifilir.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/8592104886.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/vizawi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8fa35d70a0---nutev.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zeruzewul.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/baporu.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/buwawuxibarikomawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=python+language+book+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_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 10864 bytes
SHA-256: 873b39f3dee41a5c31364cc4ea96140f7d85a3ddfc3c79d3b4d39887e07af92e
font_01_sfnt_off000130a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 19024 bytes
SHA-256: 3fb14941633d7886b6051b2b4224da16ed4573f173314bde5e603578d50ecd3c
font_02_sfnt_off000162db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1