Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc45d50f6a02109…

MALICIOUS

PDF

86.8 KB Created: 2021-07-20 04:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d366f9b0df59567ccd1a0ade5f2b1e3 SHA-1: 578b897efed9241e5ac0e45f435f24e9b776d8b4 SHA-256: 4bc45d50f6a02109f1e8e557044c907b22c05ebe26aa4582a1c1d322763514b1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised CMS upload directories. These links likely serve to redirect users to malicious content or phishing sites, a common tactic for distributing malware or stealing credentials. The presence of multiple links on disposable hosting further supports its role as a malicious distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b7ffcf312---22369804917.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c33cd607---nakodiveruwuwewixazuto.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/nivekizifizazaroso.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4d29560e4ba425f1a7bb35c1fda5d203/vutomufij.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/77116927149.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e2a271c2851736fff0fa45c11a640e44/28171189809.pdfIn PDF document text
    • http://france-ex.com/59751020119.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935d3c19704---dibogabojoxadagururusoli.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2087f24a21328f8936f41a8e2028f9f0/dukixojovugalikiwaf.pdfIn PDF document text
    • https://teddybestore.it/file/pusorafasat.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/pumaxukavoxexin.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/dozolomoxupalojusakotawo.pdfIn PDF document text
    • https://hiroyoung.com/data/files/botaxakexugolofuzuxime.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/lupejenanisomu.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/65080448995.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/1fsapap8chucc7utn7st5dm24q/70227004739.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f913787c9---71929794230.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ae63fe9fbb0138b7958e09c54bda80db/motemagekosumer.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c58632b60d26343b1f17dd210b82c0d9/86173414605.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/pabisefalip.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c549306dc6a---32982662143.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9c530292---nurogi.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/83068904222.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/37533983637.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/02c05b38485f927986ba30b043e41f31/98879549882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=friday+the+13th+memePDF 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_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 16752 bytes
SHA-256: 85b5ead9b2004fd499a79cfe24e3b624e82592840e383dd3228cdf026ac3a1ff
font_02_sfnt_off0001350c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350C 10392 bytes
SHA-256: 9baca6962ff1a9bfc82313c63425a04cec683a3ea38e4193c33f41b59706c0a1

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